// does Validation on VendorID Search TextBox private Boolean inputIsValid() { string errText = this.txtVendorIDSearch.Text; if (Validation.IsBlank(this.txtVendorIDSearch.Text) || Validation.IsNullOrEmpty(this.txtVendorIDSearch.Text)) { MessageBox.Show("There must be an Id to search for."); this.txtVendorIDSearch.Focus(); this.txtVendorIDSearch.Clear(); return(false); } else if (!Validation.IsInt(this.txtVendorIDSearch.Text)) { MessageBox.Show("'" + errText + "'" + " is not a valid Vendor ID. " + "\nId must be a numeric value."); this.txtVendorIDSearch.Focus(); this.txtVendorIDSearch.Clear(); return(false); } int venID = Convert.ToInt32(txtVendorIDSearch.Text); int maxID = _myVendorManager.GetMaxVendorID(); if (!Validation.IsIntRange(1, maxID, venID)) { MessageBox.Show("'" + errText + "'" + " is not a valid Vendor ID. " + "\nId must be greater than 0 but less than " + maxID); this.txtVendorIDSearch.Focus(); this.txtVendorIDSearch.Clear(); return(false); } return(true); }