You can remove the extension from a filename in C# using several methods. Here are a couple of common approaches:

Using Path.GetFileNameWithoutExtension Method:

You can use the Path.GetFileNameWithoutExtension method from the System.IO namespace to get the filename without the extension.

using System.IO;

string fileName = "example.txt";

string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);

Console.WriteLine(fileNameWithoutExtension); // Output: example

Using Substring Method:

You can also achieve this using string manipulation, extracting the substring before the last dot (.) occurrence.

string fileName = "example.txt";

    int index = fileName.LastIndexOf('.');

    string fileNameWithoutExtension = index == -1 ? fileName : fileName.Substring(0, index);

    Console.WriteLine(fileNameWithoutExtension); // Output: example

Both methods will give you the filename without the extension. Choose the one that best suits your needs and coding style.