Script manager popup doesn't appear

Question

I have an ASP.NET page. I want to throw a pop up upon clicking a certain button on the page. The syntax I used is this:

ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('Invalid Address!!');", true);

The popup did not appear.

However, when trying the same syntax on a different page in the same project, it worked.

Any ideas?

Answer 1

Try changing the below line from

ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('Invalid Address!!');", true);

to

ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "popup", "alert('Invalid Address!!');", true);

If for whatever reason the above code doesn't work, try the below if it works

 ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "alert",
                            "Javascript:displayAlert('Invalid Address!!');", true);

and your JS function

function displayAlert(msg) {
   alert(msg);
   return false;
}