private void buttonSave_Click(object sender, EventArgs e)
{
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "Excel Documents (*.xls)|*.xls";
sfd.FileName = "export.xls";
if (sfd.ShowDialog() == DialogResult.OK)
{
//ToCsV(dataGridView1, @"c:\export.xls");
dbc.ToCsV(dataGridView1, sfd.FileName); // Here dataGridview1 is your grid view name
}
}