Problem

How to get same Items Exist in two Data tables in third data table by linq and display in datagridview

in windows form application visual studio 2015.

Meaning I Have two datatables

First Data table is dt Get data from Excel .

Second is dtItems get data from sql server 2014 database .

I need when I have itemcode 12 and this item exist on two datatables

dt(display data from excel) AND dtItems (Display data from sql server)

show them in datagridview .

if itemcode 12 exist on dt and dtItems display on datagridview .

so that how to get similar it Items between two datatable by linq to sql in datagridview .

Code:
public DataTable ShowExcelData()
        {
            string connectionString = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 12.0 Xml;HDR=YES;IMEX=1\";", txtpath.Text);

            OleDbConnection con = new OleDbConnection(connectionString);


            con.Open();
            DataTable dt = new DataTable();

            dt = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

            string SheetName = dt.Rows[0]["TABLE_NAME"].ToString();


            OleDbCommand com = new OleDbCommand();
            com.Connection = con;
           
            com.CommandText = @"SELECT  [ItemCode],[ItemsName],[ItemAddress] FROM  [" + SheetName + "] ";
            OleDbDataAdapter oledbda = new OleDbDataAdapter();
            oledbda.SelectCommand = com;
            DataSet ds = new DataSet();
            oledbda.Fill(ds);
            dt = ds.Tables[0];
            con.Close();
            return dt;


        }
dt = ShowExcelData();

 public DataTable GetSqlItems()
        {
            string GetItems = @"select ItemCode,ItemsName,ItemAddress from Items";


           DataTable tbGetItems = DataAccess.ExecuteDataTable(GetItems );
            return tbGetItems ;
        }
dtItems = GetSqlItems();