How to create a text file and save it on client machine using Save File Dialog + Asp.Net + C#

Method to Create text file:
Using System.IO;
Using SystemsText;

private void CreatetxtFile()
{
StringBuilder sb = new StringBuilder();

sb.AppendLine("test");
sb.AppendLine("= = = = = =");
sb.AppendLine();
sb.Append("test2");
sb.AppendLine();
sb.AppendLine();

using (StreamWriter outfile = new StreamWriter("c:" + @"\AllTxtFiles.txt"))
{
outfile.Write(sb.ToString());
}

}

Code to Save the file as dialog :

Response.ContentType = "text/plain";
Response.AppendHeader("Content-Disposition", "attachment; filename=AllTxtFiles.txt");

// specify the path of the file that has to be saved in client machine.
Response.TransmitFile("c://AllTxtFiles.txt");
Response.End();

The above code will show a save file dialog to save the file.