c# Winform Make Pivot Table from Imported Excel file

I populate a Excel file to a DataGridView1, I have a DataGridView2 I want to do a pivot Table to the file that's imported. How would I read from the loaded file to datagrid?

https://www.codeproject.com/articles/22008/Articles/22008/C-Pivot-Table?fid=928849&fr=26#xx0xx

I have found a program that show how to do so but it's all Hard coded  , I need to do it from the file uploaded.

My data table is 

 #region Data Table
        public static DataTable GetDataTableExcel(string strFileName, string Table)
        {
            System.Data.OleDb.OleDbConnection conn = new System.Data.OleDb.OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0; Data Source = " + strFileName + ";Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1\";");
            conn.Open();
            string strQuery = "SELECT * FROM [" + Table + "]";
            System.Data.OleDb.OleDbDataAdapter adapter = new System.Data.OleDb.OleDbDataAdapter(strQuery, conn);
            System.Data.DataSet ds = new System.Data.DataSet();
            adapter.Fill(ds);
            return ds.Tables[0];
        }



        public static string[] GetTableExcel(string strFileName)
        {
            string[] strTables = new string[100];
            Catalog oCatlog = new Catalog();
            ADOX.Table oTable = new ADOX.Table();
            ADODB.Connection oConn = new ADODB.Connection();
            oConn.Open(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strFileName + ";Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1\";");
            oCatlog.ActiveConnection = oConn;
            if (oCatlog.Tables.Count > 0)
            {
                int item = 0;
                foreach (ADOX.Table tab in oCatlog.Tables)
                {
                    if (tab.Type == "TABLE")
                    {
                        strTables[item] = tab.Name;
                        item++;
                    }
                }
            }
            return strTables;
        }

form load

   private void Form1_Load(object sender, EventArgs e)
        {


            dt.Columns.Add("ZN", Type.GetType("System.String"));
            dt.Columns.Add("RawLnrFtDay", Type.GetType("System.String"));

     //       dt.Rows.Add(new object[] { dataGridView1.Rows[i].Cells[1].Value }); 


            dt.Rows.Add(new object[] { "", "" });
            dt.Rows.Add(new object[] { "", "" });


            dataGridView2.DataSource = dt;

            foreach (DataColumn dc in dt.Columns)
                cboX.Items.Add(dc.ColumnName);
            foreach (DataColumn dc in dt.Columns)
                cboY.Items.Add(dc.ColumnName);
            foreach (DataColumn dc in dt.Columns)
                cboZ.Items.Add(dc.ColumnName);


        }

Booney440