In order to define you own column to display you need to implement the PrepareDataBinding event handler and define the WebGrid table column you wish to display. In most of the Intersoft provided sample, the column generation is using RetrieveStructure function to auto generate the column based on the binded data schema.

Here is the snippet to show certain column of the datasource, for this example we would like to show column id, firstname, lastname, and value:

protected void grdObj_PrepareDataBinding(object sender, ISNet.WebUI.WebGrid.DataSourceEventArgs e)
{
    if (!Page.IsPostBack )
    {
        WebGridColumn wgColID = new WebGridColumn();
        wgColID.Caption = "ID";
        wgColID.DataMember = "id";
        wgColID.Name = "id";
        wgColID.Width = Unit.Pixel(150);
        grdObj.RootTable.Columns.Add(wgColID);

        WebGridColumn wgColFirstName = new WebGridColumn();
        wgColFirstName.Caption = "First Name";
        wgColFirstName.DataMember = "firstname";
        wgColFirstName.Name = "firstname";
        wgColFirstName.Width = Unit.Pixel(250);
        grdObj.RootTable.Columns.Add(wgColFirstName);

        WebGridColumn wgColLastName = new WebGridColumn();
        wgColLastName.Caption = "Last Name";
        wgColLastName.DataMember = "lastname";
        wgColLastName.Name = "lastname";
        wgColLastName.Width = Unit.Pixel(250);
        grdObj.RootTable.Columns.Add(wgColLastName);

        WebGridColumn wgColValue = new WebGridColumn();
        wgColValue.Caption = "Value";
        wgColValue.DataMember = "value";
        wgColValue.Name = "value";
        wgColValue.Width = Unit.Pixel(150);
        wgColValue.DataType = "System.Int32";
        grdObj.RootTable.Columns.Add(wgColValue);
    }
}