numeric fied

I've designed an interface to encode some fields into a typed Dataset.
There's no problem for text fields but how can I do for numeric fields ?
I've used Int32.Parse method because I got a compilator error but how can I
handle empty fields or non numeric inputs ?

DataSet1.PRORow dr = dataSet11.PRO.NewPRORow();
....
dr.PRO_SOCIETE = textBox1.Text; // text field
dr.PRO_BOITE = Int32.Parse(textBox6.Text); // numeric field
....
I plan to do this:

if (textBox6.Text == "") dr.PRO_BOITE = DBNull.Value;
else dr.PRO_BOITE = Int32.Parse(textBox6.Text);

with :

private void textBox6_KeyPress(object sender,
System.Windows.Forms.KeyPressEventArgs e)
{
if (!Char.IsDigit(e.KeyChar))
{
e.Handled = true; // only digits
}
}

Is there a better way to do this ?

Thanks,
Ced