hello how can i find component for receive picture from scanner in C#.net

Why do not work correct select command with pivot in vitual stdio 2005?(I connected to sqlserver2005)

I can change Width of combobox but how can I change width of combobox

I put dataset and bindingsource and some textbox on my form my program work correct (add,delete,edit) but I do not know how can change one field of dataset without use textbox I put this code : dataset.mytable.mycoulmn[bindingdatasource.position]="test"; but at runtime appear error of position

how can I find diagram that show relation beetwen database classes in .net (for example dataset,datareader,dataadapter...)