Merge pull request #2 from adand/dapanes

Use of object oriented programming for database access
some more object oriented design
update
fixing the compile errors
Merge pull request #3 from adand/objectOrientedDesign

some more object oriented design v.2
object oriented design
Merge pull request #4 from adand/objectOrientedDesign

Object oriented design
nothing changed
object oriented design
Merge pull request #5 from adand/objectOrientedDesign

Object oriented design
commit before create another issue-branch
dataGridView Updating
Merge pull request #6 from adand/dataGridView

Data grid view
dataGridView tests
still working on costPredefinedItems
still working
Merge pull request #7 from adand/dataGridView

Data grid view
working on dapanes
Merge pull request #8 from adand/dataGridView

working on dapanes
initial commit