datatable column size

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C#

Hi, the datatable dtTableFields has two column.
ID and name
The table in the database has name of length 5

I get an error on this line:
newRow["Name"] = "<-- Select a value -->";

and ofcourse it complains of the size.

How can I modify the code below without changing the width size of the field in the table in the database please?
Thanks

private void PopulateFieldNames()
        {
            DataTable dtTableFields = TableFieldsGet(strSomeName);

            DataRow newRow = dtTableFields.NewRow();

            newRow["Name"] = "<-- Select a value -->";

            dtTableFields.Rows.InsertAt(newRow, 0);

            cboTableFields.Items.Clear();
            cboTableFields.DisplayMember = "Name";
            cboTableFields.ValueMember = "ID";
            cboTableFields.DataSource = dtTableFields;

            cboTableFields.SelectedIndex = 0; 
        }