DataGridView's Column name not found

Question

Why do I get the exception that Column Name is not found for MyEntity as well as FullName Columns? Although I see the column names being displayed in UI.

InitializeComponent();

dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

foreach (DataGridViewRow row in dataGridView1.SelectedRows)
{
    int rowIndex = dataGridView1.Rows.IndexOf(row);
    myObject = dataGridView1.Rows[rowIndex].Cells["MyEntity"].Value as IEntityObject;
    fileName = dataGridView1.Rows[rowIndex].Cells["FullName"].Value.ToString();       
}

Answer 1

Because, infuriatingly enough, that datagridview column is not actually named the same as your DataTable column name. If you look at the column collection in the designer Properties window, you will see that is probably named something like "DataGridViewColumn4" or similar.

If you know the index, you should use that, or rename the columns to the DT column names.