//NOTE: this snippet is assumed to be in a codebehind event handler
 System.Collections.ArrayList al = new System.Collections.ArrayList();
 for(int i=0; i<5; i++){
       DataClass dc = new DataClass();
       dc.ID = i;
       dc.Description = "Collection Item " + i;
       al.Add(dc);
 }

 this.DataGrid1.AutoGenerateColumns = false;
 BoundColumn col = new BoundColumn();
 col.DataField = "Description";
 col.HeaderText = "Description";
 this.DataGrid1.Columns.Add(col);
             
 this.DataGrid1.DataSource = al;
 this.DataGrid1.DataBind();