How to bind the data source in code behind in WinForms GridGroupingControl?

Random rand = new Random();
int r = rand.Next(100);
//Generating datasourcce by using IBindingList.
dataSource = new DataCollection();
//Generating DataSource by using Random values.
for (int i = 0; i < 30; i++)
{
    dataSource.Add(new Data(r.ToString(), "Category" + r.ToString(), "Desc" + r.ToString()));
    r = rand.Next(100);
}
 //Assigning datasource for grid.
 this.gridGroupingControl1.DataSource = dataSource;
 
//used for Adding record to data source
private void btnChangeDataSource_Click(object sender, EventArgs e)
{
  DataSet ds = new DataSet();
  ReadXml(ds, @"Expand.xml");
  this.gridGroupingControl1.DataSource = ds.Tables[0];
 
}

Dim rand As New Random()
Dim r As Integer = rand.Next(100)
'Generating datasourcce by using IBindingList.
dataSource = New DataCollection()
'Generating DataSource by using Random values.
For i As Integer = 0 To 29
   dataSource.Add(New Data(r.ToString(), "Category" & r.ToString(), "Desc" & r.ToString()))
   r = rand.Next(100)
Next i
'Assigning datasource for grid.
Me.gridGroupingControl1.DataSource = dataSource
 
Private Sub btnChangeDataSource_Click (ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
  Dim ds As New DataSet()
  ReadXml(ds, "Expand.xml")
  Me.gridGroupingControl1.DataSource = ds.Tables(0)
End Sub