How to open multiselected files in datagridview in C#

 Hi

 I have alot of excel files I want to selecte Three files and show them in datagridview,

 I tried with  code but my code show only the last one, e.g I have 1,2,3 excel files,

 datagridview show only the last file 3. What should I do here please.

 Thank you!

I tried with this code:

   private void Button2_Click(object sender, EventArgs e)
   { 
    try
       {

       OpenFileDialog openFileDialog1 = new OpenFileDialog();
       openFileDialog1.Filter = "XML Files, Text Files, Excel Files|  
        *.xlsx; *.xls; *.xml;   *.txt; "; ;
       openFileDialog1.Multiselect = true;
     if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
       {
        foreach (String file in openFileDialog1.FileNames)
        {
        //tb_path is textbox
        tb_path.Text = file;
        // excelFilePath_com = tb_path.Text;
        string constr = string.Format("Provider = Microsoft.ACE.OLEDB.12.0; Data Source =" +          tb_path.Text + ";Extended Properties = \"Excel 12.0; HDR=Yes;\"; ");

        OleDbConnection con = new OleDbConnection(constr);
        con.Open();
        drop_down_sheet.DataSource = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
        //dro_down_sheet is combobox to choose which sheet to import 
        drop_down_sheet.DisplayMember = "TABLE_NAME";
        drop_down_sheet.ValueMember = "TABLE_NAME";
    }
   }