Copy Datagrid to Datatable

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C#

ASP.NET

How to copy data from datagrid to datatable. I need to delete the selected row from datagrid, for this i am trying to copy data from datagrid to datatable and deleting the selected row from datatable and bind the datatable again to datagrid. but i am getting the object reference error on the line if(dt.rows.count). what could be the problem or is there any other easy way to remove the selected row.

dt = (DataTable)Datagrid1.DataSource;

if (dt.Rows.Count > 0)
{
   dt.Rows[2].Delete();
}