How Do I Properly Encode Plus Signs ( ) in Query Strings for C# and ASP.NET?

Handling Plus Signs in Query Strings: A C# and ASP.NET Guide

Query strings sometimes lose plus signs ( ), as the plus sign signifies a space. To retain the plus sign, use percent encoding (+).

Encoding Plus Signs in C# and ASP.NET

C# and ASP.NET provide Server.UrlEncode to encode query parameters. This method handles special characters, including the plus sign, by replacing them with their percent-encoded equivalents.

Example:

<code class="language-csharp">string str = Server.UrlEncode(Request.QueryString["new"]);</code>

Decoding Considerations

Server-side scripts usually URL-decode query parameters. This means a ' ' becomes a space, while '+' remains a plus sign. To ensure a literal plus sign in your query string, always use the encoded form (+).

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