مشكلة incorrect syntax near ' '

السلام عليكم ورحمة الله وبركاته

الرجاء المساعدة فى خطأ يظهرلى فى كود الحفظ

incorrect syntax near ' '

الخطأ يظهر فى حالة وجود احرف و ارقام فى بيانات الصنف فى اول عمود بالداتا جريد

كود الحفظ

  invno = Me.TextBox1.Text 
        If tempTable.Rows.Count >= 1 Then




            Dim cmdInsH As New SqlCommand
            Dim cmdInsD As New SqlCommand




            Dim i As Integer
            Dim j As Integer




            Try
                If objconn.State = ConnectionState.Closed Then
                    objconn.Open()
                End If
                '********************************************************************
            
                With cmdInsH
                    .Connection = objconn
                    .CommandType = CommandType.Text
                End With


                cmdInsH.CommandText = "INSERT INTO invohd VALUES(" + TextBox1.Text + ",'" + DateTimePicker1.Text + "','" + ComboBox1.Text + "'," + TextBox5.Text + ")"
                cmdInsH.ExecuteNonQuery()


                '*********************************************************************
           
                With cmdInsD
                    .Connection = objconn
                    .CommandType = CommandType.Text
                End With


         
                For i = 0 To tempTable.Rows.Count - 1
                    j = 0


                    cmdInsD.CommandText = "INSERT INTO invodet VALUES(" + TextBox1.Text.ToString + "," + DataGridView1.Item(i, 0 + j).ToString + ",'" + DataGridView1.Item(i, 1 + j).ToString + "'," + DataGridView1.Item(i, 2 + j).ToString + "," + DataGridView1.Item(i, 3 + j).ToString + "," + DataGridView1.Item(i, 4 + j).ToString + ")"
                    cmdInsD.ExecuteNonQuery()
                Next i