Access database

Question

 Hi everyone,
I hope your all alright. I have been running my c sharp program using an sql server database, unfortunately it has expired so I am trying to migrate to an access data base. Below is some code I used to run using mysql and now using Microsoft access database it is not working.
if (textBox2.Text == "")
  {
  OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\katoto\Documents\Visual Studio 2010\Projects\Genesis Philcollins\data\thyfarm.accdb;Jet OLEDB:Database Password=Kyozi");
  string sql = ("select expensecodeid,expensecode,narration,cost,dateofnextp from expenseac where dateofnextp = '" + DateTime.Now.ToString("dd/MM/yyyy") + "'OR dateofnextp = '" + DateTime.Now.AddDays(1).ToString("dd/MM/yyyy") + "'OR dateofnextp = '" + DateTime.Now.AddDays(2).ToString("dd/MM/yyyy") + "'OR dateofnextp = '" + DateTime.Now.AddDays(3).ToString("dd/MM/yyyy") + "'OR dateofnextp = '" + DateTime.Now.AddDays(4).ToString("dd/MM/yyyy") + "'  AND yr LIKE '" + label5.Text + "'ORDER BY dateofnextp");
  DataSet ds;
 
  OleDbCommand cmd = new OleDbCommand();
  OleDbDataAdapter da = new OleDbDataAdapter();

  cmd = new OleDbCommand(sql, cn);
  da = new OleDbDataAdapter(cmd);
  ds = new DataSet();

  da.Fill(ds, "select expensecodeid,expensecode,narration,cost,dateofnextp");
  dataGridView1.DataSource = ds.Tables[0];
  {
  dataGridView1.Columns["expensecodeid"].Width = 100;
  dataGridView1.Columns["expensecode"].Width = 120;
 
  dataGridView1.Columns["narration"].Width = 150;
   dataGridView1.Columns["cost"].Width = 100;

  dataGridView1.Columns["dateofnextp"].Width = 100;
  }
  }
I used this code to select data with a date one,two,three,four and even five days from to days date. I have set the column "dateofnextp" in my access database to date/time – shortdate which is dd/MM/yyyy

When I run my program I am getting an error "OleDbException was unhandled - Data type mismatch in criteria expression."

Any help will be greatly appreciated.
Best Regards.Marvin