Can I return a varchar(max) from a stored procedure?

objOutParam1 = objCommand.Parameters.Add("@RStr", OleDbType.varchar)
objOutParam1.Size = 8000
objOutParam1.Direction = ParameterDirection.Output

SqlParameter p = new SqlParameter("@RStr", SqlDbType.VarChar);
p.Direction = ParameterDirection.Output;

objOutParam1.Size = Int32.MaxValue;

param.Size = int.MaxValue;
 param.SqlDbType = SqlDbType.VarBinary;