Question: Any idea how I can append popular data on unpopular data 

```
private void Bind()
{       
    var unpopular = ChannelHelper.GetUnpopular();
    var popular = ChannelHelper.GetPopular();
    Grid.DataSource = popular + unpopular; 
    Grid.DataBind();
}

```

Answer: 
Merge these two data source in a single data source and bind the GridView to the single data source.

If these data source are DataTable or DataSet, you can use [DataTable.Merge](http://msdn.microsoft.com/en-us/library/system.data.datatable.merge.aspx) Method.
I got solution by below code... 

```
data.InsertRange(0,popularChannel);

```

And this also works...

```
grdViewOrders.DataSource = populerChannel.Cast<object>().Union(data.Cast<object>());

```

Thanks all... :)