try<form id="form1" runat="server">
<asp:Label id="label1" runat="server" Text="click me" ForeColor="red"/>
<asp:Button id="btn1" runat="server" Text="Button" OnClick="TestClick" />
</form><script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
label1.Attributes["onclick"] = "javascript:document.all('btn1').click()";
}void TestClick(Object sender, EventArgs e)
{
Response.Write("****Someone clicked me****");
}</script>
<asp:Label id="label1" runat="server" Text="click me" ForeColor="red"/>
<asp:Button id="btn1" runat="server" Text="Button" OnClick="TestClick" />
</form><script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
label1.Attributes["onclick"] = "javascript:document.all('btn1').click()";
}void TestClick(Object sender, EventArgs e)
{
Response.Write("****Someone clicked me****");
}</script>
Label1.Attributes.Add("onclick","WebForm1.Button1.click();");