c# message box add warning icon code example

Example 1: winforms messagebox with button

string message = "Do you want to close this window?";  
string title = "Close Window";  
MessageBoxButtons buttons = MessageBoxButtons.YesNo;  
DialogResult result = MessageBox.Show(message, title, buttons);  
if (result == DialogResult.Yes) {  
    this.Close();  
} else {  
    // Do something  
}

Example 2: how to do a messagebox in c#

MessageBox.Show("Content", "Title", MessageBoxIcon.Error)