filter table from value from another table

 Private Sub JobHuntingForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Me.PositionCompanyTableAdapter.Fill(Me.JobHuntingDataSet.PositionCompany)
        Me.CompanyTableAdapter.Fill(Me.JobHuntingDataSet.Company)
        Me.PositionTableAdapter.Fill(Me.JobHuntingDataSet.Position)
        Me.EmployeeTableAdapter.Fill(Me.JobHuntingDataSet.Employee)
        Me.ContactTableAdapter.Fill(Me.JobHuntingDataSet.Contact)
End Sub
Private Sub ziptextBox_TextChanged(sender As Object, e As EventArgs) Handles zipTextBox.TextChanged
        If zipTextBox.TextLength > 0 Then
            Me.CompanyBindingSource.Filter = "Salary Like '" & zipTextBox.Text & "%'"
            allPositionButton.Visible = True
        Else Me.CompanyBindingSource.RemoveFilter()
        End If
    End Sub

I want to filter the 'Positions' that have a particular 'Company' Zip Code