using (File.Create("somefile"))
{
   //nothing here...
};

string path = @"c:tempMyTest.txt";
try
{

    // Delete the file if it exists.
    if (File.Exists(path))
    {
        // Note that no lock is put on the
        // file and the possibility exists
        // that another process could do
        // something with it between
        // the calls to Exists and Delete.
        File.Delete(path);

        //Here you can create a new file with different name also using while loop
    }

    // Create the file.
    using (FileStream fs = File.Create(path))
    {
        Byte[] info = new UTF8Encoding(true).GetBytes("This is some text in the file.");
        // Add some information to the file.
        fs.Write(info, 0, info.Length);
    }

    // Open the stream and read it back.
    using (StreamReader sr = File.OpenText(path))
    {
        string s = "";
        while ((s = sr.ReadLine()) != null)
        {
            Console.WriteLine(s);
        }
    }
}

catch (Exception Ex)
{
    Console.WriteLine(Ex.ToString());
}