{
string excelConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\mca23.xls;Extended Properties=""Excel 8.0;HDR=YES;""";

        OleDbConnection con = new OleDbConnection(excelConnectionString);
        con.Open();
        OleDbCommand cmd = new OleDbCommand("SELECT * FROM [Sheet1$]", con);
        OleDbDataReader rdr = cmd.ExecuteReader();
        DataTable schema = rdr.GetSchemaTable();
        
            foreach (DataRow row in schema.Rows)
            {
                int i = 0;
                foreach (DataColumn col in schema.Columns)
                {  //
                    if (i == 0)
                    {
                         Response.Write(row[0]);
                    }
                    i = i + 1;
                }
            }
            rdr.Close();
        }