asp.net c# from server side lauch popup and wait for response before executing next line

Question

I want to launch a modal popup from c# code and wait for user to hit the ok button before executing the next c# line.

I tried the following

 System.Web.UI.ScriptManager.RegisterStartupScript(this, this.GetType(), "script", alertMessage, true);

but it does not pause to wait for use to hit the ok button and keeps going.

I also tried this

Response.Write(@"<script language='javascript'>alert( " + alertMessage + " );</script>");

But it returning an error message

Any help is appreciated

Answer 1

Create a simple method on aspx page

  <script type="text/javascript">
        function openModal(id) {
            $(id).modal('show');
        }
    </script>

Then call this function in code like

ScriptManager.RegisterStartupScript(this, this.GetType(), "Pop", "openModal('#yourModalID');", true);