Question

In WinForms applications, I can have a textbox1.keydown event, but I want to achieve the same thing in a WebForm (ASP.NET), so how can I do that?

I need to retrieve data from the database on this event.

Answer 1

You can use onkeydown event, which will then call your client side function. Inside the client side function, you can make an ajax call to populate data from database.

    <asp:TextBox ID="txtName" runat="server" onkeydown="javascript: callMe();" />

    function callMe()
    {
        $.ajax({
          url: 'URLOFTHEFUNCTION',
          type: 'GET',
          cache: false,
          success: function (result) {
              alert(result)
          }
       });
   }