Hi Hans,

Thank you for posting.

The Padding property of the DataGridView.DefaultCellStyle represents the
space between the edge of a DataGridViewCell and its content. Setting the
Padding property only affects where the editing control of the
DataGridViewCell is drawn.

The margin or padding you see in the cells is between the text and the cell
bound. If you want to reduce the padding, I think you should handle the
DataGridView's CellPainting event to draw the cells by yourself.

Here is a sample for you.

public partial class Form1 : Form
   {
       public Form1()
       {
           InitializeComponent();
           this.dataGridView1.CellPainting += new
DataGridViewCellPaintingEventHandler(dataGridView1_CellPainting);
       }

       void dataGridView1_CellPainting(object sender,
DataGridViewCellPaintingEventArgs e)
       {
           // ignore the column header and row header cells
           if (e.RowIndex != -1 && e.ColumnIndex != -1)
           {
               e.PaintBackground(e.ClipBounds, true);
               e.Graphics.DrawString(Convert.ToString(e.FormattedValue),
e.CellStyle.Font, Brushes.Black, e.CellBounds.X, e.CellBounds.Y,
StringFormat.GenericDefault);
               e.Handled = true;
           }
       }
   }

Hope this is helpful to you.
If you have  anything unclear, please don't hesitate to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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