Create Error File

public void LogErrorToFile(string strPageName, string strMsg)

    {

        string strLogFilePath = System.Web.HttpContext.Current.Server.MapPath("~/Log/StateContractEmployee.txt");

        System.IO.File.AppendAllText(strLogFilePath, Environment.NewLine + strPageName + " : " + System.DateTime.Now.ToString() + " -- '" + strMsg + "'" + Environment.NewLine);

    }