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Editorial Team
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Asked: 2026-06-06T19:07:36+00:00

I have a button and onclick is set to this method which should display

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I have a button and onclick is set to this method which should display a simple JS alert pop up window:

string message = "File is already open. <br>Please close the file and try again.";
    System.Text.StringBuilder sb = new System.Text.StringBuilder();
    sb.Append("<script type = 'text/javascript'>");
    sb.Append("window.onload=function(){");
    sb.Append("alert('");
    sb.Append(message);
    sb.Append("')};");
    sb.Append("</script>");
    ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", sb.ToString());

I have used the code above before and it has worked but not this time.
The only difference is that I was using master pages for the other site and not for this one, and this one also has a timer going.

Is there anything JS related to load in the <head> of the aspx page?

protected void btnToCSV_Click(object sender, EventArgs e)
    {
        try
        {
            StreamWriter writer = new StreamWriter(@"\\server location\test.csv");

            Some writer.write stuff...

            writer.Close();
        }
        catch (Exception ex)
        {
            lblMessage.Visible = true;
            string message = "File is already open. Please close the file and try again.";
            ClientScript.RegisterClientScriptBlock(
               this.GetType(),
              "alert",
              string.Format("alert('{0}');", message),
              true);

        }
}
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1 Answer

  1. Editorial Team

    Try with this simplyfied version

    string message = "File is already open. <br>Please close the file and try again.";
ScriptManager.RegisterClientScriptBlock(
  UpdatePanel1, // replace UpdatePanel1 by your UpdatePanel id
  UpdatePanel1.GetType(), // replace UpdatePanel1 by your UpdatePanel id
  "alert", 
  string.Format("alert('{0}');",message), 
  true );
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