How to change a specific datagridview column format

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C#

WinForms

Hi I have a datagridview which displays my records in currency format BUT I have a particular column which I wanna display it values as an Integer.

The column i wanna change and what it displays

[AreaCode]
 15,00 €
 25,00 €
 60,00 €

My expectation:

[AreaCode]
  15
  25
  60

And here is my code which isn't working:

private void dgv1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
var columnname = "AreaCode";
if (e.ColumnIndex == dgv1.Columns[columnname].Index)
            {
                //Get the datagridview cell
       DataGridViewCell cell = dgv1.Rows[e.RowIndex].Cells[e.ColumnIndex];
                if (cell != null)
                {
      this.dgv1.Columns["AreaCode"].DefaultCellStyle.Format = "D4";

                }


            }

}