' Visual Basic
Private Property DynamicColumnAdded() As Boolean
Get
If ViewState("ColumnAdded") Is Nothing Then
Return False
Else
Return True
End If
End Get
Set(ByVal Value As Boolean)
ViewState("ColumnAdded") = Value
End Set
End Property

Protected Overrides Sub LoadViewState(ByVal savedState As Object)
MyBase.LoadViewState(savedState)
If Me.DynamicColumnAdded Then
Me.AddColums()
End If
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
' Check property to be sure columns are not added more than once
If Me.DynamicColumnAdded Then
Return
Else
Me.AddColums()
End If
End Sub

Protected Sub AddColums()
' Add two columns
Dim dgc_id As New BoundColumn()
dgc_id.DataField = "instock"
dgc_id.HeaderText = "In Stock?"
dgc_id.ItemStyle.Width = New Unit(80)
DataGrid1.Columns.Add(dgc_id)

Dim dgc_title As New BoundColumn()
dgc_title.DataField = "title"
dgc_title.HeaderText = "Title"
DataGrid1.Columns.Add(dgc_title)
Me.DataGrid1.DataBind()
Me.DynamicColumnAdded = True
End Sub

// C#
private bool DynamicColumnAdded{
get
{
object b = ViewState["DynamicColumnAdded"];
return (b == null) ? false : true;
}
set
{
ViewState["DynamicColumnAdded"] = value;
}
}

protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
if (DynamicColumnAdded)
{
this.AddColumns();
}
}

private void Button1_Click(object sender, System.EventArgs e)
{
if(this.DynamicColumnAdded != true)
{
this.AddColumns();
}
}

private void AddColumns()
{
BoundColumn dgc_id = new BoundColumn();
dgc_id.DataField = "bookid";
dgc_id.HeaderText = "ID";
dgc_id.ItemStyle.Width = new Unit(80);
DataGrid1.Columns.Add(dgc_id);

BoundColumn dgc_title= new BoundColumn();
dgc_title.DataField = "title";
dgc_title.HeaderText = "Title";
DataGrid1.Columns.Add(dgc_title);

this.sqlDataAdapter1.Fill(this.dsBooks1);
DataGrid1.DataBind();
this.DynamicColumnAdded = true;
}
Adding New Records to a Data Source Using the DataGrid Control
The DataGrid control allows users to view and edit records, but does not inherently include the facility to add new ones. However, you can add this functionality in various ways, all of which involve the following:

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