Inserting ID from combo box into SQL Server using VB.net - sql-server

Question

I have a VB form and a combobox linked to a datasource.
The database has two tables Position (SLOT, ID_WH) and Warehouse (ID_WH, WH_NAME).
The combobox is linked to the warehouse, and it shows the WH_NAME.
I need to get the ID_WH to insert into the Position table.
The code is:
WH_CB.DisplayMember = "Warehouse" 'Column name
WH_CB.ValueMember = "ID_WH" 'Column name2
'ADD INFO TO Position (SLOT)
Dim Remove_space_start As String = SLOT_TXT.Text
Dim CharStart() As Char = {" "}
Dim Stringstart As String = Remove_space_start.TrimStart(CharStart)
Dim CharEnd() As Char = {" "}
Dim StringEnd As String = Stringstart.TrimEnd(CharEnd)
Try
objconnection.Open()
cmd.Connection = objconnection
cmd.CommandText = "InsertDataIntoPosition"
cmd.CommandType = CommandType.StoredProcedure
cmd.Parameters.AddWithValue("SLOT", StringEnd)
cmd.Parameters.AddWithValue("ID_WH", WH_CB.SelectedValue)
cmd.ExecuteNonQuery()
MessageBox.Show("sucess")
'Refresh DATAGRID
dgv_slot.DataSource = Nothing
dgv_slot.Refresh()
Dim str As String = "select * from Position"
Using cmd As New SqlCommand(str, objconnection)
Using da As New SqlDataAdapter(cmd)
Using newtable As New DataTable
da.Fill(newtable)
dgv_slot.DataSource = newtable
End Using
End Using
End Using
Catch ex As Exception
MessageBox.Show("Error while inserting record on table..." &
ex.Message,
"Insert Records")
Finally
objconnection.Close()
End Try
I've tried to show the whcb with a messagebox, and it shows the ID_WH, but trying to insert data into the table I get the error:
System.Data.SqlClient.SqlException: 'Conversion failed when converting the nvarchar value 'Armazem4 ' to data type int.'
Any help?

Answer 1

It's solved, thank you very much.
I had the same field name (with different types) in different tables, So I was forcing the wrong one to get the information.
After I corrected that, its working fine.