Problem with clientscript.registerstartupsc...

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C#

ASP.NET

Javascript

exceptions

I have the following code in aspx file:-

<form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
    </div>
    </form>

In the code behind I am trying to run a javascript alert by using ClientScript.RegisterStartupScript.
The logic of my program is that I first create an unhandled exception in the button click event as follows:-

int l1 = int.Parse("Madhukar"); // This causes exception

and then that exception is propogated to page level automatically as it is unhandled and is automatically handled by the following page level error handler method:-

protected void Page_Error(object sender, EventArgs e)

In this method I handle this exception event using

Exception ex = Server.GetLastError(); // This gets the latest exception in the program.

I use the following code to get the error message:-

string message = string.Format("At Page Level : Message: {0}\\n\\n", ex.Message);
        message += string.Format("StackTrace: {0}\\n\\n", ex.StackTrace.Replace(Environment.NewLine, 

string.Empty));
        message += string.Format("Source: {0}\\n\\n", ex.Source.Replace(Environment.NewLine, 

string.Empty));
        message += string.Format("TargetSite: {0}\\n\\n", ex.TargetSite.ToString().Replace

(Environment.NewLine, string.Empty));

Then I try to show a message in a javascript alert message using the following code:-

ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert(\"" + message + "\");", true);

The problem is it doesn't show a javascript alert. I even tried a simple :

ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('hi msg from server');", true);

This also didn't show an alert popup.

I used the following code also:-

Response.Write(message);  //This works
Response.Write("<script type='text/javascript'>alert('" + message + "');</script>"); // This also works.

They both work fine and show the javascript alert and write to the resulting webpage.

The final code is as follows:-

protected void Button1_Click(object sender, EventArgs e)
    {
        int l1 = int.Parse("Madhukar"); // This causes unhandled exception
    }


 protected void Page_Error(object sender, EventArgs e)
    {
        Exception ex = Server.GetLastError();

string message = string.Format("At Page Level : Message: {0}\\n\\n", ex.Message);
        message += string.Format("StackTrace: {0}\\n\\n", ex.StackTrace.Replace(Environment.NewLine, 

string.Empty));
        message += string.Format("Source: {0}\\n\\n", ex.Source.Replace(Environment.NewLine, 

string.Empty));
        message += string.Format("TargetSite: {0}\\n\\n", ex.TargetSite.ToString().Replace

(Environment.NewLine, string.Empty));

ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert(\"" + message + "\");", true); 

//Show the javascript pop up alert.

}

Please help.

What I have tried:

I tried :-

ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('hi msg from server');", true);
This also didn't show an alert popup.

I also tried

ClientScriptManager cs = Page.ClientScript;

        // Check to see if the startup script is already registered.
        if (!cs.IsStartupScriptRegistered(this.GetType(), "alert"))
        {
            cs.RegisterClientScriptBlock(this.GetType(), "alert", "alert('hi msg from server');", true);
        }

this also doesn't work.

I also tried :-

ScriptManager.RegisterStartupScript(this.Page, Page.GetType(), "", script, true);

This also doesn't work