Just include the following code on server side (Form Load event). drpList.Attributes.Add("onchange", "JavaScriptFunctionName();"); or drpList.Attributes.Add("onclick", "JavaScriptFunctionName();"); We can add properties using the Attributes method.

Shanmugam R

You can achive through Dropdown on click Javascript event. Based on the selected value function EnableValidator() { if(document.getElementById('<%=ddlCmethod.ClientID%>').value=='Telephone') { ValidatorEnable(document.getElementById('<%=valmanEmail.ClientID%>'), false); ValidatorEnable(document.getElementById('<%=valmanPhone.ClientID%>'), true); } else { ValidatorEnable(document.getElementById('<%=valmanEmail.ClientID%>'), true); ValidatorEnable(document.getElementById('<%=valmanPhone.ClientID%>'), false); } } Just call 'EnableValidator()' function on click of the dropdownlist This will work.

Shanmugam R

If you are using TD then the code will be written like this, '<%#Eval()%>'

Shanmugam R

b>You can raise server side event when the mouse over the imagebutton. function Show() { document.getElementById('<%=ImageButton1.ClientID%>').click(); } ServerSide code protected void Page_Load(object sender, EventArgs e) { ImageButton1.Attributes.Add("onmouseover", "Show();"); } protected void ImageButton1_Click(object sender, ImageClickEventArgs e) { // Write your event handler... }

Shanmugam R