Looping in insert value into database(SQL SERVER 2005)

Imports System.Data
Imports System.Data.SqlClient
Public Class LoopingDB
    Dim con As SqlConnection
    Dim cmd As SqlCommand
    Dim reader As SqlDataReader
    Dim constring As String
    Dim SqlString As String
    Dim myConnection As SqlConnection
    Dim myCommand As SqlCommand
    Dim Da As SqlDataAdapter
    Dim Ds As DataSet
    Dim ra As Integer
    Dim myDA As New SqlDataAdapter
    Dim MyDS As New _FKIP_UNILAKDataSet()
    Dim numAffected As Integer
    Private Sub LagiiBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LagiiBindingNavigatorSaveItem.Click
        Me.Validate()
        Me.coordinateBindingSource.EndEdit()
        Me.coordinateTableAdapter.Update(Me._FKIP_UNILAKDataSet.coordinate)

    End Sub

    Private Sub LoopingDB_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the '_FKIP_UNILAKDataSet.lagii' table. You can move, or remove it, as needed.
        Me.LagiiTableAdapter.Fill(Me._FKIP_UNILAKDataSet.lagii)
        constring = "Data Source=RAGAZ-PC\SQLEXPRESS;Initial Catalog=FKIP-UNILAK;Integrated Security=True"
        con = New SqlConnection(constring)
        con.Open()
        Da.Fill(Ds, "coordinate")
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim i, j As Integer
        For i = 1 To 3
            For j = 1 To 2
                
                SqlString = "Insert coordinate  values ('" (i) " ','" (j) "')"  ' Here the problem
                cmd = New SqlCommand(SqlString, con)
                numAffected = cmd.ExecuteNonQuery
            Next
        Next
        MessageBox.Show("Data coordinate saved", "SUKSES", MessageBoxButtons.OK, MessageBoxIcon.Information)
        Me.coordinateTableAdapter.Fill(Me._FKIP_UNILAKDataSet.lagii)
    End Sub
End Class

X_Value                 Y_Value<br />
   1                       1<br />
   1                       2<br />
   2                       1<br />
   2                       2<br />
   3                       1 <br />
   3                       2