validation for user input -beginner-

my main.cs code is like this:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace CarTracker

public partial class Main : Form

public Main()

InitializeComponent();

private void listingBindingNavigatorSaveItem_Click(object sender, EventArgs e)

this.Validate();
this.listingBindingSource.EndEdit();
this.tableAdapterManager.UpdateAll(this.carTrackerDataSet);

private void Form1_Load(object sender, EventArgs e)

// TODO: This line of code loads data into the 'carTrackerDataSet.CarType' table. You can move, or remove it, as needed.
this.carTypeTableAdapter.Fill(this.carTrackerDataSet.CarType);
// TODO: This line of code loads data into the 'carTrackerDataSet.Make' table. You can move, or remove it, as needed.
this.makeTableAdapter.Fill(this.carTrackerDataSet.Make);
// TODO: This line of code loads data into the 'carTrackerDataSet.Color' table. You can move, or remove it, as needed.
this.colorTableAdapter.Fill(this.carTrackerDataSet.Color);
// TODO: This line of code loads data into the 'carTrackerDataSet.Listing' table. You can move, or remove it, as needed.
this.listingTableAdapter.Fill(this.carTrackerDataSet.Listing);

private void fillByColorNameToolStripButton_Click(object sender, EventArgs e)

try

this.listingTableAdapter.FillByColorName(this.carTrackerDataSet.Listing, colornameToolStripTextBox.Text);

catch (System.Exception ex)

System.Windows.Forms.MessageBox.Show(ex.Message);

private void fillByCarTypeNameToolStripButton_Click(object sender, EventArgs e)

try

this.listingTableAdapter.FillByCarTypeName(this.carTrackerDataSet.Listing, cartypenameToolStripTextBox.Text);

catch (System.Exception ex)

System.Windows.Forms.MessageBox.Show(ex.Message);

private void fillByMakeNameToolStripButton_Click(object sender, EventArgs e)

try

this.listingTableAdapter.FillByMakeName(this.carTrackerDataSet.Listing, makenameToolStripTextBox.Text);

catch (System.Exception ex)

System.Windows.Forms.MessageBox.Show(ex.Message);