Why Isn't My C# `string.Replace()` Method Working?

Debugging C# String Replacements: Understanding Immutability

The common issue of string.Replace() seemingly failing in C# stems from the language's string immutability. When you use string.Replace(), it doesn't modify the original string. Instead, it creates a new string with the replacements made.

To correctly use string.Replace(), you must either assign the result to a new variable:

<code class="language-csharp">string newString = someTestString.Replace(someID.ToString(), sessionID);</code>

Or, reassign the returned value back to the original variable:

<code class="language-csharp">someTestString = someTestString.Replace(someID.ToString(), sessionID);</code>

This principle extends to other C# string manipulation methods like Remove(), Insert(), Trim(), and substring methods. They all return a new string; the original string remains unchanged.

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