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WPF DataGrid add rows problem?

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Hi guys

In windows form I have used this code to add rows in datagridview

Private Sub fill_plan()
        dgMonth.Rows.Clear()
        Try
            Dim i As Integer = 0
            Dim query As String = "SELECT MonID,Unitname,Personel,Mdate FROM tblMonth ORDER BY Unitname"
            cmd = New SqlCommand(query, clsMSSQL.con)
            myDR = cmd.ExecuteReader
            If myDR.HasRows Then
                While myDR.Read
                    dgMonth.Rows.Add()
                    dgMonth.Rows(i).Cells(0).Value = myDR.GetInt32(myDR.GetOrdinal("MonID"))
                    dgMonth.Rows(i).Cells(1).Value = myDR.GetString(myDR.GetOrdinal("Unitname"))
                    Dim myday As Integer = DatePart(DateInterval.Day, myDR.GetValue(myDR.GetOrdinal("Mdate")))
                    dgMonth.Rows(i).Cells(myday + 1).Value = myDR.GetInt32(myDR.GetOrdinal("Personel"))
                    i = i + 1
                End While
            End If
            myDR.Close()
        Catch ex As Exception
            MsgBox(ex.Message, MsgBoxStyle.Critical, "Error")
        End Try
    End Sub

I  have used this code in WPF but the problem is that datagrid don't add rows

How can i do that?

Thanks in advance


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