You should look up some resources on 'naming conventions'.

If you really want to give them all the same name, add a prefix that identifies them such as:

clsCoolThing - for a class
dsCoolThing - for a DataSet
dbCoolThing - for a Database
dtCoolThing - for a DataTable

Same thing goes for your variables:

strMyString - for a string type
intMyNumber - for an integer type
blnMyFlag - for a boolean flag

And so on...

It makes your code easier to read, debug and maintain. It also makes it much easier for other developers to do the same.

Steve