protected void Button1_Click(object sender, EventArgs e) {
int d = 10;
string confirmValue = Request.Form["confirm_value"];
if (confirmValue == "Yes") {
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('You clicked YES!')", true);
} else {
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('You clicked NO!')", true);
}
function Confirm(days) {
var confirm_value = document.createElement("INPUT");
confirm_value.type = "hidden";
confirm_value.name = "confirm_value";
if (confirm("Do you want to save data?")) {
confirm_value.value = "Yes";
} else {
confirm_value.value = "No";
}
document.forms[0].appendChild(confirm_value);
}
// HTML
<!--
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" OnClientClick = "Confirm(10)" />