Delete file in c#

using System.IO;

Delete respective file

string fileName = "test.txt";

string sourcePath = @"C:\Test Folder";

string sourceFile = Path.Combine(sourcePath, fileName);

if (File.Exists(sourceFile))

{

    File.Delete(sourceFile);

}

Delete all files

string sourcePath = @"C:\Test Folder";

string[] sourcefiles = Directory.GetFiles(sourcePath);

foreach (string sourcefile in sourcefiles)

{

    File.Delete(sourcefile);

}

Delete only .txt extension files

string sourcePath = @"C:\Test Folder";

string[] sourcefiles = Directory.GetFiles(sourcePath);

foreach (string sourcefile in sourcefiles)

{

    string ext = Path.GetExtension(sourcefile);

    if (ext.Equals(".txt"))

    {

        File.Delete(sourcefile);

    }

}