Question

I have a LinkButton click event in asp.net 3.5 that I must assess whether a value exists and return a alert.
I have no idea how you can do. I think we need to Ajax
Can someone help me

Thanks

Answer 1

Here is a pretty simple solution without getting too involved with a lot of AJAX.

If you have your link button in your page:

<asp:LinkButton id="myButton" Text="Click me" OnClick="myButton_Click" runat="server" />

Add an event handler in your page’s code behind:

protected void myButton_Click(object sender, EventArgs e)
{
    // Check some stuff on the server...

    ClientScript.RegisterStartupScript(this.GetType(), "alert", "myJsMethod()", true);
}

This example will call a JavaScript function called myJsMethod on your page which you can then call any JS you like including your alert().