how can i run a bat file from windows server in c#.net

You can read a codeproject article about it here : Run Interactive Command Shell or Batch Files From ASP.NET[^]

You can use the below code
String BatchFilePath = "D:\\scripts\\batchfile1.bat";
if (File.Exists(BatchFilePath))
{

System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo.FileName = BatchFilePath;
proc.StartInfo.RedirectStandardError = false;
proc.StartInfo.RedirectStandardOutput = false;
proc.StartInfo.UseShellExecute = false;
proc.Start();
proc.WaitForExit();
}

:)