Searching Database using Dataset in C#

Question

private void button1_Click(object sender, EventArgs e)

        {

            TransportSystemDataSetTableAdapters.StaffTableAdapter s1 = new TransportSystemDataSetTableAdapters.StaffTableAdapter();

           

            //search staff table database 

            //where textbox1.text = staffid nd textbox2.text = staffpswd 

            // return true;

            //else return"invalid";

}

I have this function, and I also have two textbox (textbox1 and textbox2) which is for the ID and Password of a staff. 

When staff clicks button, I want to search my database if his record exists and return true or invalid. but I want to do this using the Dataset. 


How do I do this?

Thanks