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

Handling Plus Signs in ASP.NET Query Strings

When working with C# and ASP.NET, passing parameters via URL query strings can present challenges, particularly when a parameter includes a plus ( ) sign. The plus sign is interpreted as a space, causing it to be lost or misinterpreted.

This occurs because the plus sign acts as a whitespace delimiter in standard URL encoding. To ensure the plus sign is correctly transmitted and received, it needs to be URL-encoded. The URL-encoded equivalent of a plus sign is +.

The solution is to replace all instances of with + before sending the query string. In ASP.NET, the Server.UrlEncode method provides a convenient way to achieve this.

Here's how you can use Server.UrlEncode to correctly encode a query string parameter containing a plus sign:

string encodedValue = Server.UrlEncode(Request.QueryString["new"]); // Encodes '+' to '%2B'

This code snippet takes the value of the "new" query string parameter, encodes it using Server.UrlEncode, and stores the encoded result in encodedValue. This ensures the plus sign is properly represented and avoids data loss. Remember to perform this encoding before sending the request to the server. This will guarantee the server correctly interprets the plus sign as a literal character within the parameter value.

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