Hi.....
'Programmerboy' given me an idea and depending on that I tried to solve my issue and got it. I write the code like this and I got my issue solved.

private void button1_Click(o bject sender, EventArgs e)
{
Stream myStream = null;
DialogResult dlgResult = MessageBox.Show ("Do you want to continue?", "Continue?" , MessageBoxButto ns.YesNo,...

Actually it's a windows application with C# ,what I need is, to validate a text box and then depending on the result, I need to navigate to next page or same page with one button control and with other button control I need to open a file dialogue box..........
Like when we write something in notepad and close it with out saving then a message box will be displayed with options like Yes, No, Cancel clicking on Yes we will get file dialogue...

I have an application in which, I have to display a message box depending on a validation if yes, I have to stay in the same page otherwise a file dialogue box is to be displayed.
can you please help me to get it.....