[Solved] Javascript alert from server side

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ASP.NET

Javascript

Hi,

I have to show a message-box when the data gets stored.
I have used this code...

It worked fine when i tested it with demo website...But when i applied it in my web-application, it showed me no error but also the message-box didn't popup.

protected void btnok_Click(object sender, EventArgs e)
      {
          try
          {
              string _status = "Pending";
              //bool _result = _objVreg.insertdata(_strTablename, txtname.Text.ToString(), txtmobileno.Text.ToString(), txtcompany.Text.ToString(), txtpurpose.Text.ToString(), ddldepartment.SelectedItem.ToString(), ddlcontacperson.SelectedItem.ToString(), txtcity.Text.ToString(), System.DateTime.Now, Session["UserName"].ToString(), "", _status);
              bool _result = _objVreg.insertdata(_strTablename, txtname.Text.ToString(), txtmobileno.Text.ToString(), txtcompany.Text.ToString(), txtpurpose.Text.ToString(), ddlbranch.SelectedValue.ToString(), ddldepartment.SelectedValue.ToString(), ddlcontacperson.SelectedValue.ToString(), txtcity.Text.ToString(), System.DateTime.Now, "", "", _status, txtluggage.Text.Trim());
              if (_result == true)
              {
                  Alert.Show("Record Added Successfully");

              }
              else
              {
                  lblMsg.Text = "Record Not Added, Please Try Again";
              }
          }
          catch (Exception ex)
          {
              Response.Write(ex.Message);
          }
      }

I have added a class named "Alert.cs" which shows any popup passed as string.
The class is

public static class Alert
   {

       /// <summary>
       /// Shows a client-side JavaScript alert in the browser.
       /// </summary>
       /// <param name="message">The message to appear in the alert.</param>
       public static void Show(string message)
       {
           // Cleans the message to allow single quotation marks
           string cleanMessage = message.Replace("'", "\\'");
           string script = "<script type=\"text/javascript\">alert('" + cleanMessage + "');</script>";

           // Gets the executing web page
           Page page = HttpContext.Current.CurrentHandler as Page;

           // Checks if the handler is a Page and that the script isn't already on the Page
           if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert"))
           {
               page.ClientScript.RegisterClientScriptBlock(typeof(Alert), "alert", script);
           }
       }

   }

Please guide me...

UPDATE:
OP resolved it by himself and posted it as one of the answer.