Update datagridview columns

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VB

I have a ComboBox which has two options and six textboxes. How do I get textboxes data into Datagridview when the columns of the datagridview will show N/A or 0(zero) with the other option.

What I have tried:

Private Sub btnUpdate_Click(sender As Object, e As EventArgs) Handles btnUpdate.Click



DataGridView1.Rows.Add (TextBox1.Text, TextBox2.Text,
TextBox6.Text, TextBox13.Text, TextBox20.Text, TextBox3.Text, TextBox4.Text, TextBox5.Text,TextBox7.Text, TextBox14.Text, TextBox21.Text, TextBox6.Text, TextBox7.Text, TextBox8.Text, TextBox9.Text, TextBox10.Text, TextBox11.Text, TextBox12.Text)

End Sub