DataGridView ComboBox - vb.net

Question

I have a program which has a datagridview with two combobox and two textbox. The first combobox contains OIDs and the other Combobox contains SNMP Operation (Get & GetNext).
Now I want to add another ComboBox beside my OID’s Combobox which contains description for the OIDs (like 1.3.6.1.2.1.1.1.0 for sysDescr and so on), and also the value of the New ComboBox(the one with description of OIDs) changes automatically as the user changes the OID in the first combobox. Is it possible? If yes then how?
Here is the code:
Imports System
Imports SnmpSharpNet
Public Class Form1
Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
End Sub
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
DataGridView1.Columns.Add("NameOne", "Column One")
DataGridView1.Columns.Add("NameTwo", "Column Two")
Dim dataGridRow As New DataGridViewRow()
Dim cells As DataGridViewCell() = New DataGridViewCell(1) {}
Dim txt1A As New DataGridViewTextBoxCell()
Dim txt1B As New DataGridViewTextBoxCell()
txt1A.Value = "Host"
txt1B.Value = "115.186.118.130"
dataGridRow.Cells.Add(txt1A)
txt1A.[ReadOnly] = True
dataGridRow.Cells.Add(txt1B)
dataGridRow.Height = 20
DataGridView1.Rows.Add(dataGridRow)
dataGridRow = New DataGridViewRow()
cells = New DataGridViewCell(1) {}
Dim txt2A As New DataGridViewTextBoxCell()
Dim cbo1 As New DataGridViewComboBoxCell()
cbo1.Items.Add("1.3.6.1.2.1.1.1.0")
cbo1.Items.Add("1.3.6.1.2.1.1.2.0")
cbo1.Items.Add("1.3.6.1.2.1.1.3.0")
cbo1.Items.Add("1.3.6.1.2.1.1.4.0")
cbo1.Items.Add("1.3.6.1.2.1.1.5.0")
cbo1.Value = cbo1.Items(0)
cbo1.[ReadOnly] = False
txt2A.Value = "OIDs"
dataGridRow.Cells.Add(txt2A)
txt2A.[ReadOnly] = True
dataGridRow.Cells.Add(cbo1)
dataGridRow.Height = 20
DataGridView1.Rows.Add(dataGridRow)
Dim requestOid() As String
requestOid = New String() {cbo1.Selected}
dataGridRow = New DataGridViewRow()
cells = New DataGridViewCell(1) {}
Dim txt3A As New DataGridViewTextBoxCell()
Dim cbo2 As New DataGridViewComboBoxCell()
cbo2.Items.Add("Get")
cbo2.Items.Add("GetNext")
cbo2.Value = cbo2.Items(0)
cbo2.[ReadOnly] = False
txt3A.Value = "SNMP Operation"
dataGridRow.Cells.Add(txt3A)
txt3A.[ReadOnly] = True
dataGridRow.Cells.Add(cbo2)
dataGridRow.Height = 20
DataGridView1.Rows.Add(dataGridRow)
dataGridRow = New DataGridViewRow()
cells = New DataGridViewCell(1) {}
Dim txt4A As New DataGridViewTextBoxCell()
Dim txt4B As New DataGridViewTextBoxCell()
txt4A.Value = "Community String"
txt4B.Value = "public"
dataGridRow.Cells.Add(txt4A)
dataGridRow.Cells.Add(txt4B)
dataGridRow.Height = 20
DataGridView1.Rows.Add(dataGridRow)
End Sub
Private Sub dataGridView1_EditingControlShowing(ByVal sender As Object, ByVal e As DataGridViewEditingControlShowingEventArgs)
Dim comboControl As DataGridViewComboBoxEditingControl = TryCast(e.Control, DataGridViewComboBoxEditingControl)
If comboControl IsNot Nothing Then
' Set the DropDown style to get an editable ComboBox
If comboControl.DropDownStyle <> ComboBoxStyle.DropDown Then
comboControl.DropDownStyle = ComboBoxStyle.DropDown
End If
End If
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim result As Dictionary(Of Oid, AsnType)
Dim cbo1 As New DataGridViewComboBoxCell()
Dim txt1B As New DataGridViewTextBoxCell()
txt1B.Value = "203.81.211.117"
Dim host As String
Dim community As String
host = DataGridView1.Rows(0).Cells(1).Value.ToString
community = DataGridView1.Rows(3).Cells(1).Value.ToString
Dim txt4B As New DataGridViewTextBoxCell()
txt4B.Value = "public"
Dim snmp As New SimpleSnmp
snmp = New SimpleSnmp(DataGridView1.Rows(0).Cells(1).Value.ToString, DataGridView1.Rows(3).Cells(1).Value.ToString)
'abc.Text = txtsnmpaction.SelectedItem
result = snmp.Get(SnmpVersion.Ver1, New String() {DataGridView1.Rows(1).Cells(1).Value.ToString()})
'result = snmp.GetNext(SnmpVersion.Ver1, requestoid)
'If (txtsnmpaction = "GetBulk")
'result = snmp.GetBulk(New String() {".1.3.6.1.2", ".1.3.6.1.3"})
' End If
If Not snmp.Valid Then
MessageBox.Show("Invalid hostname/community")
End If
If result IsNot Nothing Then
Dim kvp As KeyValuePair(Of Oid, AsnType)
For Each kvp In result
MessageBox.Show(kvp.Key.ToString)
MessageBox.Show(SnmpConstants.GetTypeName(kvp.Value.Type))
MessageBox.Show(kvp.Value.ToString())
Next kvp
Else
MessageBox.Show("No results received")
End If
End Sub
End Class

Answer 1

I'd make the SNMP Operation a read-only text field and set it programatically. Handle the DataGridView1.CellValueChanged event.
EDIT: Changing description rather than SNMP operation.
Private Sub DataGridView1_CellValueChanged(sender As Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellValueChanged
If e.ColumnIndex = 3 Then
Dim Row As DataGridViewRow = DataGridView1.Rows(e.RowIndex)
Dim Description As String = Nothing
Select Case Row.Cells(3).Value
Case "1.3.6.1.2.1.1.1.0" : Description = "sysDescr"
...
End Select
Row.Cells(5).Value = Description ' Change (5) to description column index.
End If
End Sub