Question

I have a DataGridView in which I have to do cell validations for double and integer values as well as checking whether they are empty. How to do it?

Answer 1

For cell value validation you may handle DataGridView.CellValidatingEvent. Here you can process cell values as you wish. For example:

private void dgvMarks_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
{
    if(dataGridView1[e.ColumnIndex, e.RowIndex].Value == null)
        e.Cancel = true;
}

If you want to validate numbers, you may do something like that:

int temp = 0;
if(!int.TryParse(dataGridView1[e.ColumnIndex, e.RowIndex].Value.ToString(), out temp))
    e.Cancel = true;