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function cheatTheClient(btn1){
if(btn1!=null){
btn1.style.display="none";
document.getElementById('btn2').style.display='block';
}
return true;
}
<div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" OnClientClick="return cheatTheClient(this)" />
<input id="btn2" type="button" value="Button" disabled="disabled" style="display:none;" />
</div>
<script type="text/javascript">
function cheatTheClient(btn1){
if(btn1!=null){
btn1.style.display="none";
document.getElementById('btn2').style.display='block';
}
return true;
}
</script>
protected void Button1_Click ( object sender, EventArgs e ) {
for ( int i = 0; i < 1000000000; i++ ) {
int j = 1;
}
MessageBox ("disable !");
}
public void MessageBox ( string str ) {
string msg = string.Format ( "<script language=\"javascript\" type=\"text/javascript\">alert(\"{0}\");</script>", str );
Page.ClientScript.RegisterStartupScript ( this.GetType (), "Warning", msg );
}