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HttpUtility.xml
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<Type Name="HttpUtility" FullName="System.Web.HttpUtility">
<TypeSignature Language="C#" Value="public sealed class HttpUtility" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi sealed beforefieldinit HttpUtility extends System.Object" />
<TypeSignature Language="DocId" Value="T:System.Web.HttpUtility" />
<TypeSignature Language="VB.NET" Value="Public NotInheritable Class HttpUtility" />
<TypeSignature Language="F#" Value="type HttpUtility = class" />
<TypeSignature Language="C++ CLI" Value="public ref class HttpUtility sealed" />
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Web.Services</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Web.HttpUtility</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
<AssemblyVersion>4.0.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Web.HttpUtility" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Web.HttpUtility" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Web.HttpUtility" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Web.HttpUtility" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Web.HttpUtility" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces />
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(2)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(2)>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Provides methods for encoding and decoding URLs when processing Web requests. This class cannot be inherited.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.HttpUtility> class is used internally by the <xref:System.Web.HttpServerUtility> class, whose methods and properties are exposed through the intrinsic ASP.NET <xref:System.Web.HttpContext.Server%2A> object. Additionally, the <xref:System.Web.HttpUtility> class contains encoding and decoding utility methods that are not accessible from the <xref:System.Web.HttpContext.Server%2A>.
To encode or decode values outside of a web application, use the <xref:System.Net.WebUtility> class.
## Examples
The following code example demonstrates the use of the <xref:System.Web.HttpUtility.UrlEncode%2A>, <xref:System.Web.HttpUtility.UrlDecode%2A> and <xref:System.Web.HttpUtility.ParseQueryString%2A> methods of the <xref:System.Web.HttpUtility> class.
:::code language="aspx-csharp" source="~/snippets/csharp/VS_Snippets_WebNet/HttpUtilityExample/cs/httputilityexample.aspx" id="Snippet1":::
:::code language="aspx-vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/HttpUtilityExample/vb/httputilityexample.aspx" id="Snippet1":::
]]></format>
</remarks>
<altmember cref="T:System.Web.HttpServerUtility" />
<altmember cref="P:System.Web.HttpContext.Server" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/a2a4yykt(v=vs.100)">How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings</related>
</Docs>
<Members>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public HttpUtility ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpUtility.#ctor" />
<MemberSignature Language="VB.NET" Value="Public Sub New ()" />
<MemberSignature Language="C++ CLI" Value="public:
 HttpUtility();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Web.Services</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Web.HttpUtility</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
<AssemblyVersion>4.0.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")>]</AttributeName>
</Attribute>
</Attributes>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Web.HttpUtility" /> class.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.HttpUtility> class exposes methods for encoding and decoding string based URLs, URL tokens, and paths. The <xref:System.Web.HttpUtility> is used internally by the <xref:System.Web.HttpServerUtility> class.
]]></format>
</remarks>
</Docs>
</Member>
<MemberGroup MemberName="HtmlAttributeEncode">
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Minimally converts a string into an HTML-encoded string.</summary>
</Docs>
</MemberGroup>
<Member MemberName="HtmlAttributeEncode">
<MemberSignature Language="C#" Value="public static string? HtmlAttributeEncode (string? s);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig string HtmlAttributeEncode(string s) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpUtility.HtmlAttributeEncode(System.String)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function HtmlAttributeEncode (s As String) As String" />
<MemberSignature Language="F#" Value="static member HtmlAttributeEncode : string -> string" Usage="System.Web.HttpUtility.HtmlAttributeEncode s" />
<MemberSignature Language="C++ CLI" Value="public:
 static System::String ^ HtmlAttributeEncode(System::String ^ s);" />
<MemberSignature Language="C#" Value="public static string HtmlAttributeEncode (string s);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
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<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
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<AssemblyInfo>
<AssemblyName>System.Web.Services</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Web.HttpUtility</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
<AssemblyVersion>4.0.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.String</ReturnType>
<Attributes>
<Attribute FrameworkAlternate="net-5.0">
<AttributeName Language="C#">[System.Diagnostics.CodeAnalysis.NotNullIfNotNull("s")]</AttributeName>
<AttributeName Language="F#">[<System.Diagnostics.CodeAnalysis.NotNullIfNotNull("s")>]</AttributeName>
</Attribute>
</Attributes>
</ReturnValue>
<Parameters>
<Parameter Name="s" Type="System.String" />
</Parameters>
<Docs>
<param name="s">The string to encode.</param>
<summary>Minimally converts a string to an HTML-encoded string.</summary>
<returns>An encoded string.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.HttpUtility.HtmlAttributeEncode%2A> method encodes characters appropriate for insertion into an HTML attribute value.
The string result from the <xref:System.Web.HttpUtility.HtmlAttributeEncode%2A> method should be used only for double-quoted attributes. Security issues might arise when using the <xref:System.Web.HttpUtility.HtmlAttributeEncode%2A> method with single-quoted attributes.
]]></format>
</remarks>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/a2a4yykt(v=vs.100)">How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings</related>
</Docs>
</Member>
<Member MemberName="HtmlAttributeEncode">
<MemberSignature Language="C#" Value="public static void HtmlAttributeEncode (string? s, System.IO.TextWriter output);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig void HtmlAttributeEncode(string s, class System.IO.TextWriter output) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Web.HttpUtility.HtmlAttributeEncode(System.String,System.IO.TextWriter)" />
<MemberSignature Language="VB.NET" Value="Public Shared Sub HtmlAttributeEncode (s As String, output As TextWriter)" />
<MemberSignature Language="F#" Value="static member HtmlAttributeEncode : string * System.IO.TextWriter -> unit" Usage="System.Web.HttpUtility.HtmlAttributeEncode (s, output)" />
<MemberSignature Language="C++ CLI" Value="public:
 static void HtmlAttributeEncode(System::String ^ s, System::IO::TextWriter ^ output);" />
<MemberSignature Language="C#" Value="public static void HtmlAttributeEncode (string s, System.IO.TextWriter output);" FrameworkAlternate="netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-1.1;netframework-2.0;netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;netstandard-2.0;netstandard-2.1" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.Web</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
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</AssemblyInfo>
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<AssemblyName>System.Web.HttpUtility</AssemblyName>
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<AssemblyVersion>4.0.1.0</AssemblyVersion>
<AssemblyVersion>4.0.2.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="s" Type="System.String">
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(2)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(2)>]</AttributeName>
</Attribute>
</Attributes>
</Parameter>
<Parameter Name="output" Type="System.IO.TextWriter" />
</Parameters>
<Docs>
<param name="s">The string to encode.</param>
<param name="output">A <see cref="T:System.IO.TextWriter" /> output stream.</param>
<summary>Minimally converts a string into an HTML-encoded string and sends the encoded string to a <see cref="T:System.IO.TextWriter" /> output stream.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.HttpUtility.HtmlAttributeEncode%2A> method converts only double quotation marks ("), single quotation marks ('), ampersands (&), and left angle brackets (<) to equivalent character entities. It is considerably faster than the <xref:System.Web.HttpUtility.HtmlEncode%2A> method.
The string result from the <xref:System.Web.HttpUtility.HtmlAttributeEncode%2A> method should be used only for double-quoted attributes. Security issues might arise when using the <xref:System.Web.HttpUtility.HtmlAttributeEncode%2A> method with single-quoted attributes.
]]></format>
</remarks>
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/a2a4yykt(v=vs.100)">How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings</related>
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<summary>Converts a string that has been HTML-encoded for HTTP transmission into a decoded string.
To encode or decode values outside of a web application, use the <see cref="T:System.Net.WebUtility" /> class.</summary>
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## Remarks
If characters such as blanks and punctuation are passed in an HTTP stream, they might be misinterpreted at the receiving end. HTML encoding converts characters that are not allowed in HTML into character-entity equivalents; HTML decoding reverses the encoding. For example, when embedded in a block of text, the characters \< and > are encoded as `<` and `>` for HTTP transmission.
To encode or decode values outside of a web application, use the <xref:System.Net.WebUtility> class.
## Examples
The following code example demonstrates the <xref:System.Web.HttpUtility.HtmlEncode%2A> and <xref:System.Web.HttpUtility.HtmlDecode%2A> methods of the <xref:System.Web.HttpUtility> class. The input string is encoded using the <xref:System.Web.HttpUtility.HtmlEncode%2A> method. The encoded string obtained is then decoded using the <xref:System.Web.HttpUtility.HtmlDecode%2A> method.
:::code language="csharp" source="~/snippets/csharp/VS_Snippets_WebNet/HttpUtility_HtmlDecode/CS/httputility_htmldecode.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/HttpUtility_HtmlDecode/VB/httputility_htmldecode.vb" id="Snippet1":::
]]></format>
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<format type="text/markdown"><![CDATA[
## Remarks
If characters such as blanks and punctuation are passed in an HTTP stream, they might be misinterpreted at the receiving end. HTML encoding converts characters that are not allowed in HTML into character-entity equivalents; HTML decoding reverses the encoding. For example, when embedded in a block of text, the characters \< and > are encoded as `<` and `>` for HTTP transmission.
To encode or decode values outside of a web application, use the <xref:System.Net.WebUtility> class.
]]></format>
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<summary>Converts a string into an HTML-encoded string.
To encode or decode values outside of a web application, use the <see cref="T:System.Net.WebUtility" /> class.</summary>
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<param name="value">An object.</param>
<summary>Converts an object's string representation into an HTML-encoded string, and returns the encoded string.</summary>
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<format type="text/markdown"><![CDATA[
## Remarks
To encode or decode values outside of a web application, use the <xref:System.Net.WebUtility> class.
]]></format>
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## Remarks
If characters such as blanks and punctuation are passed in an HTTP stream, they might be misinterpreted at the receiving end. HTML encoding converts characters that are not allowed in HTML into character-entity equivalents; HTML decoding reverses the encoding. For example, when embedded in a block of text, the characters \< and > are encoded as `<` and `>` for HTTP transmission.
To encode or decode values outside of a web application, use the <xref:System.Net.WebUtility> class.
## Examples
The following code example demonstrates the <xref:System.Web.HttpUtility.HtmlEncode%2A> and <xref:System.Web.HttpUtility.HtmlDecode%2A> methods of the <xref:System.Web.HttpUtility> class. The input string is encoded using the <xref:System.Web.HttpUtility.HtmlEncode%2A> method. The encoded string obtained is then decoded using the <xref:System.Web.HttpUtility.HtmlDecode%2A> method.
:::code language="csharp" source="~/snippets/csharp/VS_Snippets_WebNet/HttpUtility_HtmlDecode/CS/httputility_htmldecode.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/HttpUtility_HtmlDecode/VB/httputility_htmldecode.vb" id="Snippet1":::
]]></format>
</remarks>
<altmember cref="M:System.Web.HttpUtility.HtmlDecode(System.String)" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/a2a4yykt(v=vs.100)">How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings</related>
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## Remarks
If characters such as blanks and punctuation are passed in an HTTP stream, they might be misinterpreted at the receiving end. HTML encoding converts characters that are not allowed in HTML into character-entity equivalents; HTML decoding reverses the encoding. For example, when embedded in a block of text, the characters \< and >, are encoded as `<` and `>` for HTTP transmission.
To encode or decode values outside of a web application, use the <xref:System.Net.WebUtility> class.
]]></format>
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<altmember cref="M:System.Web.HttpUtility.HtmlDecode(System.String,System.IO.TextWriter)" />
<related type="Article" href="https://docs.microsoft.com/previous-versions/aspnet/a2a4yykt(v=vs.100)">How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings</related>
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<summary>Encodes a string.</summary>
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<format type="text/markdown"><![CDATA[
## Remarks
This method encodes strings. For instance, single quotation marks and double quotation marks are included as `\u0027` and `\"` in the encoded string.
]]></format>
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<param name="query">The query string to parse.</param>
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<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.Web.HttpUtility.ParseQueryString%2A> method uses <xref:System.Text.Encoding.UTF8%2A> format to parse the query string In the returned <xref:System.Collections.Specialized.NameValueCollection>, URL encoded characters are decoded and multiple occurrences of the same query string parameter are listed as a single entry with a comma separating each value.
> [!IMPORTANT]
> The <xref:System.Web.HttpUtility.ParseQueryString%2A> method uses query strings that might contain user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see [Script Exploits Overview](https://docs.microsoft.com/previous-versions/aspnet/w1sw53ds(v=vs.100)).
## Examples
The following code example demonstrates how to use the <xref:System.Web.HttpUtility.ParseQueryString%2A> method. Multiple occurrences of the same query string variable are consolidated in one entry of the returned <xref:System.Collections.Specialized.NameValueCollection>.
:::code language="csharp" source="~/snippets/csharp/VS_Snippets_WebNet/HttpUtility_ParseQueryString/cs/httputility_parsequerystring.cs" interactive="try-dotnet" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_WebNet/HttpUtility_ParseQueryString/vb/httputility_parsequerystring.vb" id="Snippet1":::
]]></format>
</remarks>
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## Remarks
In the returned <xref:System.Collections.Specialized.NameValueCollection>, URL encoded characters are decoded and multiple occurrences of the same query string parameter are listed as a single entry with a comma separating each value.
> [!IMPORTANT]
> The <xref:System.Web.HttpUtility.ParseQueryString%2A> method uses query strings that might contain user input, which is a potential security threat. By default, ASP.NET Web pages validate that user input does not include script or HTML elements. For more information, see [Script Exploits Overview](https://docs.microsoft.com/previous-versions/aspnet/w1sw53ds(v=vs.100)).
]]></format>
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