this.MyCombo.SelectedIndexChanged += new EventHandler(MyCombo_SelectedIndexChange);

private void MyCombo_SelectedIndexChange(object sender, EventArgs e)
{
    // Add event handler code here
}

AddHandler me.MyCombo.SelectedIndexChanged, AddressOf MyCombo_SelectedIndexChange

Private Sub MyCombo_SelectedIndexChange(ByVal sender As Object, ByVal e As EventArgs)
   ' Add event handler code here.
End Sub

this.MyCombo.SelectedIndexChanged -= new EventHandler(MyCombo_SelectedIndexChange);

RemoveHandler me.MyCombo.SelectedIndexChanged, AddressOf MyCombo_SelectedIndexChange

from a solution provided by Bonnie Berent in Message #1146017

for (int i=0; i < MyTable.Columns.Count; i++)
{
    if (!MyTable.Rows[RowNum][i, DataRowVersion.Default].Equals(MyTable.Rows[RowNum][i,DataRowVersion.Original]))
       // column has changed
}

from a solution provided by John Baird in Message #1222494

protected void btnShowCompany_Click(object sender, EventArgs e)
{
  myGridView.DataSource = MyCustomerTable;
  myGridView.AutoGenerateColumns = false;
  myGridView.Columns.Clear();
  AddField(myGridView,"customerID","customer\'s ID");
  AddField(myGridView, "companyName", "Company Name");
  myGridView.DataBind();
}
protected void btnShowContact_Click(object sender, EventArgs e)
{
  myGridView.DataSource = MyContactTable;
  myGridView.AutoGenerateColumns = false;
  myGridView.Columns.Clear();
  AddField(myGridView,"customerID","customer\'s ID");
  AddField(myGridView, "contactName", "Contact Name");
  AddField(myGridView, "contactTitle", "Contact Title");
  myGridView.DataBind();
}

private void AddField(GridView gv, string dataField, string caption)
{
      BoundField bf = new BoundField();
      bf.DataField = dataField;
      bf.HeaderText = caption;
      gv.Columns.Add(bf);
}

from a solution provided by Çetin Basöz in Message #1134680

public class Form1 : Form
{
	public Form1()
	{
		this.tabControl = new System.Windows.Forms.TabControl();
		this.tabPage1 = new System.Windows.Forms.TabPage();
		this.tabPage2 = new System.Windows.Forms.TabPage();
		this.button = new System.Windows.Forms.Button();
		this.tabControl.Controls.Add(this.tabPage1);
		this.tabControl.Controls.Add(this.tabPage2);
		this.tabPage1.Controls.Add(this.button);
		this.button.Location = new System.Drawing.Point(25, 39);
		this.button.Text = "activate second page";
		this.button.Click += new System.EventHandler(this.button_Click);
		this.Controls.Add(this.tabControl1);
	}
	private System.Windows.Forms.TabControl tabControl;
	private System.Windows.Forms.TabPage tabPage1;
	private System.Windows.Forms.TabPage tabPage2;
	private System.Windows.Forms.Button button;
	
	private void button_Click(object sender, EventArgs e)
	{
		this.tabControl.SelectedTab = this.tabPage2;
	}
}

from a solution provided by Çetin Basöz in Message #1170940