Between 2 DatesQuery Problem of DataSet with MS Access DataBase

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C#

ASP.NET

MS-Access

database

In SQL it shows correct Result, but in MS Access 2003 no Data Shows through DataSet. But same query shows result through SQL View in MS Access.
Code is :

string str = "select checktime from CHECKINOUT where UserId=2 and checktime between 04/11/2013 and 04/12/2013";
private DataSet DSet(string str)
    {
        OleDbConnection con = new OleDbConnection(ConnectionString);
        com = new OleDbCommand(str, con);
        oledbda = new OleDbDataAdapter(com);
        DataSet ds = new DataSet();
        oledbda.Fill(ds);
        return ds;
    }

ds Returns no any Data.Please correct it.