save value of both combo box in a public String variable
Code on form1 where there are 2 combo box
public strSource as string=""
public strDest as string=""
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
strSource =ComboBox1.Text
End Sub
Private Sub ComboBox2_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox2.SelectedIndexChanged
strDest =ComboBox2.Text
End Sub
Now on Form2 where there is DataGridView1 write below code on form2 load
DataGridView1.Rows.Add(form1.strSource,form1.strDest)
i assume there are two coloums in DataGridView1
Happy Coding.....