Read unknown data from oledbdatareader?

Question

HI,
If I use this code below
command = new OleDbCommand(SQLQUERY, myconn)
myReader = command.ExecuteReader();
while (myReader.Read())
{
while (i < myReader.FieldCount)
   {   
      value = value + myReader.GetString(i) + "\t ";
      i++;
   }
listBox1.Items.Add(value);
value = "";
i = 0;
}
Then all the data must be of string value, Is there a option to check the type of value the next value is or must i know this?