Check out example codes for " yes no cancel". It will help you in understanding the concepts better.

Code Example 1

Dim result As DialogResult = MessageBox.Show("message", "caption", MessageBoxButtons.YesNoCancel)
If result = DialogResult.Cancel Then
    MessageBox.Show("Cancel pressed")
ElseIf result = DialogResult.No Then
    MessageBox.Show("No pressed")
ElseIf result = DialogResult.Yes Then
    MessageBox.Show("Yes pressed")
End If

Code Example 2

var proceed = confirm("Are you sure you want to proceed?");
if (proceed) {
} else {
  //don't proceed

Code Example 3

if (confirm('Are you sure ?')) {

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