clicking the combobox message will appear to the user

Question

when the user clicks the combobox i want to show the message to the user please select the id first.

please send the code using csharp or vb.net.

i am doing using web application.please send the code it is great helpful for me.

Thanks & Regards,
RAO!.,

Satyapriya Nayak · Answer

Hi Sarika Make sure AutoPostBack property of the dropdownlist to True Thanks

Sarika · Answer

try this. hope it helps. protected void DropDownList1_SelectedIndexChanged(object sender EventArgs e) { if (ListBox1.SelectedItem == null) { MessageBoxShow(this Please select listitem first.); } } private void MessageBoxShow(Page page string message) { Literal ltr = new Literal(); ltr.Text = @ alert(' + message + ') ; page.Controls.Add(ltr); } Sarika