WinForms DataGridView font size

    private void UpdateFont()
    {
        //Change cell font
        foreach(DataGridViewColumn c in dgAssets.Columns)
        {
            c.DefaultCellStyle.Font = new Font("Arial", 8.5F, GraphicsUnit.Pixel);
        }
    }

I think it's easiest:

First set any Label as you like (Italic, Bold, Size etc.) And:

yourDataGridView.Font = anyLabel.Font;

In DataGridView, right click properties, In RowTemplate > DefaultCellStyle change the Font Size, It worked for me

Use the Font-property on the gridview. See MSDN for details and samples:

http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.font.aspx