VS 2008 [RESOLVED] datagridview combobox binding Error ( system.format exception )

Private Sub BindGridCombo_Depots()
 
        Dim SQL_bind = <sql>SELECT
stationregistry.StationName as CrewDepot,
depot_config.DepotId
FROM
stationregistry
INNER JOIN depot_config ON stationregistry.StationId = depot_config.StationId_Fk
WHERE stationregistry.CrewBase = "Y"
;
</sql>
        Dim S As String = SQL_bind.Value.ToString
        Dim Cnn896 As New MySqlConnection
        Dim Cmd896 As New MySqlCommand(S, Cnn896)
        Dim Da896 As New MySqlDataAdapter(Cmd896)
        Dim Ds896 As New DataSet
 
        Dim Cnm As New ConnectionManager
        Cnm.InitializeConnectionProperty(Cs)
 
        Dim Dt_Sepot As New DataTable
 
        With Da896
            Cnm.Connect(Cnn896)
            .Fill(Ds896, "Container")
            Cnm.DisConnect(Cnn896)
            .Dispose()
            Cmd896.Dispose()
        End With
 
        Dt_Sepot = Ds896.Tables("Container")
        Ds896.Dispose()
 
        With Me.Depot_Source
            .DataSource = Dt_Sepot
        End With
 
        With Me.Dgv_CrewDetail
             
             Me.DepotCombo.ValueType = GetType(String)
            Me.DepotCombo.DataPropertyName = "StationName"
            Me.DepotCombo.DisplayMember = "CrewDepot"
            Me.DepotCombo.ValueMember = "DepotId"
             Me.DepotCombo.DataSource = Depot_Source
            
        End With
    End Sub

Private Sub Bind_FullGrid()
 
        Dim SQL_bind = <sql>SELECT
crewregistry.CrewName,
crewregistry.Designation,
stationregistry.StationName,
crewregistry.CugNumber,
crewregistry.PerNumber,
crewregistry.CRISid,
lidata.LIname,
crewregistry.Inactive,
crewregistry.CrewId
FROM
crewregistry
INNER JOIN depot_config ON crewregistry.CrewBaseId_Fk = depot_config.DepotId
INNER JOIN stationregistry ON depot_config.StationId_Fk = stationregistry.StationId
INNER JOIN lidata ON crewregistry.NliId_Fk = lidata.LiId;
</sql>
 
 
        Dim S As String = SQL_bind.Value.ToString
        Dim Cnn896 As New MySqlConnection
        Dim Cmd896 As New MySqlCommand(S, Cnn896)
        Dim Da896 As New MySqlDataAdapter(Cmd896)
        Dim Ds896 As New DataSet
 
        Dim Cnm As New ConnectionManager
        Cnm.InitializeConnectionProperty(Cs)
 
        Dim Dt_FullGrid As New DataTable
 
        With Da896
            Cnm.Connect(Cnn896)
            .Fill(Ds896, "Container")
            Cnm.DisConnect(Cnn896)
            .Dispose()
            Cmd896.Dispose()
        End With
 
        Dt_FullGrid = Ds896.Tables("Container")
        Ds896.Dispose()
 
        With Me.S_fullGridBiner
            .DataSource = Dt_FullGrid
        End With
 
        With Me.Dgv_CrewDetail
            .DataSource = S_fullGridBiner
        End With
 
    End Sub

Private Sub CrewBiodata_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
        Me.Dgv_CrewDetail.AutoGenerateColumns = False '' Columns + DataProperty name of columns set at design time
        Me.Dgv_CrewDetail.AllowUserToAddRows = True
 
 
 
        Call BindGridCombo_Depots() '' 
        Call BindGridCombo_Li() '' Bind another combobox column
        Call Bind_FullGrid() ''  data property of the columns are set in design time
 
    End Sub