C# ADO Wyszukiwanie danych, nie uwzględnia parametrów OleDbCommand

OleDbConnection database;
string strPath;

strPath = AppDomain.CurrentDomain.BaseDirectory + "Baza.mdb";
string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strPath;
database = new OleDbConnection(connectionString);
database.Open();

string findText = "t";
string queryString = "SELECT Contactnr,Name FROM Person WHERE Name LIKE '%@p1%' ORDER BY Name;";
            OleDbCommand command = new OleDbCommand(queryString,database);
            DataTable data = null;
           
            command.Connection = database;
            command.Parameters.Add(new OleDbParameter("@p1", findText));
            
            
            OleDbDataAdapter dataAdapter = null;
                
            data = new DataTable();
            dataAdapter = new OleDbDataAdapter(command);
            dataAdapter.Fill(data);
database.close();

string findText = "t";
string queryString = "SELECT Contactnr,Name FROM Person WHERE Name LIKE @p1 ORDER BY Name;";
            OleDbCommand command = new OleDbCommand(queryString,database);
            DataTable data = null;

            command.Connection = database;
            command.Parameters.Add(new OleDbParameter("@p1", "%" + findText + "%"));