Duplicate column in DataTable when adding row

Question

I create a DataTable and bind it to a DataGrid. My DataSource consist of one Table (FooTable) which consist of one column (FooName).

The following codes runs fine - exce

Answer 1

try setting AutoGenerateColumns to false

 dg1.AutoGenerateColumns = false

Answer 2

Try

dg1.AutoGenerateColumns = false;

Should do the work for you. For now the datagrid automatically generates the columns AND adds the one you asked