Contains not working with query string that contains forward slash in asp net


ASP.NET is a popular programming language used for building web . It provides a powerful for creating dynamic and interactive websites. However, there are certain challenges that developers may face while working with ASP.NET, such as query strings that contain forward slashes.

The Problem

By , ASP.NET treats forward slashes in query strings as path separators. This can cause issues when the query itself contains forward slashes. For example, consider the following URL:

In this case, the query string parameter “param” has a value of “value/123”. However, ASP.NET will interpret the forward slash as a path separator and treat it as a different parameter. This can lead to unexpected and incorrect results.

The Solution

To solve this problem, we need to encode the forward slash in the query string. This can be done the HttpUtility.UrlEncode method in ASP.NET. This method will encode the forward slash as “%2F”, which can be included in the query string.

string encodedValue = HttpUtility.UrlEncode("value/123");

The encodedValue variable will now contain “value%2F123”. This encoded value can be safely included in the query string without causing any issues.


Let's consider an example where we have a web page that accepts a query string parameter called “id”. The value of this parameter can contain forward slashes. We want to retrieve this value and display it on the page.

string encodedId = .QueryString["id"];
string decodedId = HttpUtility.UrlDecode(encodedId);

In this example, we first retrieve the encoded value of the “id” parameter from the query string using Request.QueryString["id"]. We then use HttpUtility.UrlDecode to decode the value and store it in the decodedId variable.

Now, we can use the decodedId variable to display the value on the web page:

By encoding and decoding the query string parameter, we ensure that any forward slashes in the value are properly handled and do not cause any issues in our ASP.NET .


Handling query strings that contain forward slashes can be a challenge in ASP.NET. However, by using the HttpUtility.UrlEncode and HttpUtility.UrlDecode methods, we can safely encode and decode the values, ensuring that our application works correctly even with forward slashes in the query string.

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