Confirmation Message Box

btnSave.OnClientClick = string.Format("return confirm('Do you want to continue?');");

This should be place in the Page_Load.Once placed it there when the user the clicks the button the confirm message will be popup. This is executed at the client side.

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MessageBox/Popup


private void DisplayMessages(string message)
{
try
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "Popup", "alert('" + message + "');", true);
}
catch (Exception ex)
{
lblError.Text = ex.Message;
}
}

This a message box which displays the messages as a windows popup. When you use this make sure that you are using it for the end of event. Otherwise it wont allow to execute the rest of the code.