Merge two excel sheets in vb.net

I have two Excel files. One is a DataList and the other is a Matrix. I need to code the Datalist according to the Matrix. So, whatever the values are in the matrix it would populate the Datalist according to the mathcing Offercode. For example.

Here are the data list fields: CustID, First, Name, Address, City, State, Zip, Offercode

Here are the matrix fields: Amount, Date, Expiration, Offercode.

I need the final output to look like this.

(DataList)CustID, (DataList)First, (DataList)Name, (DataList)Address, (DataList)City, (DataList)State, (DataList)Zip, (DataList)Offercode, (Matrix)Amount, (Matrix)Date, (Matrix)Expiration.

To further explain my Vb.net form I have two text boxes and buttons that when pressed browse to the excel files. I then have two comboBoxes that are populated by the headers in the Excel sheets. I want to use to link the tables together. So, like ComboBox1.SelectedItem = ComboBox2.SelectedItem. The theory is that I can load any two lists and map them together as long as the two ComboBox items have the same values within them.

Also, the lists column names will vary moving forward so I need it to select all columns no matter what their header names will be

Not sure how to accomplish this, any help would be great, here is my code thus far:

Code:

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Dim xlDirectionLeft As Object = Excel.XlDirection.xlToLeft
    Dim xlDirectionRight As Object = Excel.XlDirection.xlToRight
    Dim xlApp As Excel.Application
    Dim xlWorkBook As Excel.Workbook
    Dim xlWorkSheet As Excel.Worksheet
    Dim misValue As Object = System.Reflection.Missing.Value
    Dim i As Integer
    Dim j As Integer
    xlApp = New Excel.Application
    xlWorkBook = xlApp.Workbooks.Add(DataListFile)
    xlWorkSheet = xlWorkBook.Sheets("sheet1")

        Dim MyConnection As System.Data.OleDb.OleDbConnection
        Dim MyConnection2 As System.Data.OleDb.OleDbConnection
        Dim MyCommand As System.Data.OleDb.OleDbDataAdapter
        Dim MyCommand2 As System.Data.OleDb.OleDbDataAdapter

        MyConnection = New System.Data.OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + MatrixFile + ";Extended Properties=Excel 12.0;")
        MyConnection2 = New System.Data.OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + DataListFile + ";Extended Properties=Excel 12.0;")

        MyCommand = New System.Data.OleDb.OleDbDataAdapter("select * from [Sheet1$]", MyConnection)
        MyCommand2 = New System.Data.OleDb.OleDbDataAdapter("select * from [Sheet1$]", MyConnection2)
        Dim DtSet1 = New System.Data.DataSet
        Dim DtSet2 = New System.Data.DataSet

        MyConnection.Open()
        MyConnection2.Open()

        MyCommand.Fill(DtSet1)
        MyCommand2.Fill(DtSet2)

    xlWorkBook.Save()
    xlApp.Workbooks.Close()
    xlApp.Quit()

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