private void btnAddDriver_Click(object sender, EventArgs e) { string TextLastName = textLastName.Text; string TextFirstName = textFirstName.Text; string TextMiddleName = textMiddleName.Text; if (!String.IsNullOrEmpty(TextLastName) || !String.IsNullOrEmpty(TextFirstName) || !String.IsNullOrEmpty(TextMiddleName)) { _driverLogic.Add(new Driver { FistName = TextFirstName, LastName = TextLastName, MiddleName = TextMiddleName }); var driver = _driverLogic.GetAll(); if (driver == null) { return; } GridViewClient(driver); } }