How to display ‘No data’ when a field value is null

<asp:DataGrid id='DataGrid1' OnItemDataBound=ItemDB runat='server'></asp:DataGrid>

VB.NET

Private Sub Page_Load(sender As Object, e As System.EventArgs)
	’ Put user code to initialize the page here
	If Not Page.IsPostBack Then
		’Populate the DataGrid
	End If
End Sub ’Page_Load 

Protected Sub ItemDB(ByVal s As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs)
	If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then
		If e.Item.Cells(1).Text = ' ' Then
			e.Item.Cells(1).Text = 'No data'
		End If
	End If
End Sub ’ItemDB

C#

private void Page_Load(object sender, System.EventArgs e)
{
	// Put user code to initialize the page here
	if(!Page.IsPostBack )
	{
		//Populate the DataGrid
	}
}

protected void ItemDB (Object s  , System.Web.UI.WebControls.DataGridItemEventArgs e  )
{
	if ((e.Item.ItemType ==ListItemType.Item) ||(e.Item.ItemType ==ListItemType.AlternatingItem))
	{
		if( e.Item.Cells[1].Text == ' ')  
		{
			e.Item.Cells[1].Text = 'No data';
		}
	}
}

In Cells[x]/Cells(x) x=> index number