You have to create the separate method for binding the Data in Combo Box
Add Two ComboBox in Form Design and in Code past these line:
 Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.BindCBFirst()
        Me.BindCBSecond()
    End Sub
    Private Sub BindCBFirst()
        Dim dt As New DataTable()
        dt.Columns.Add("Id", GetType(Integer))
        dt.Columns.Add("Country", GetType(String))
        dt.Rows.Add(1, "USA")
        dt.Rows.Add(2, "England")
        dt.Rows.Add(3, "India")
        Me.ComboBox1.DisplayMember = "Country"
        Me.ComboBox1.ValueMember = "ID"
        Me.ComboBox1.DataSource = dt
    End Sub
    Private Sub BindCBSecond()
        Dim dt As New DataTable()
        dt.Columns.Add("Id", GetType(Integer))
        dt.Columns.Add("Country", GetType(String))
        dt.Rows.Add(1, "USA")
        dt.Rows.Add(2, "England")
        dt.Rows.Add(3, "India")
        Me.ComboBox2.DisplayMember = "Country"
        Me.ComboBox2.ValueMember = "ID"
        Me.ComboBox2.DataSource = dt
    End Sub
Thank You.