Gandrung Electric and Electronic Store which located at district Kasian, Bantul, Yogyakarta , still had manual processing and inputing data. Item recording input and output, amount of debt and credit, and also item transaction still centered onto manual record ( by writing) and that only rely on memory and notes that the owner had itself. So that without realized, debt rise without exact calculation, and not transparable employe became a serious problem in this store. This Application designed using C# programming languange based desktop application, and with Software development life cycle (SDLC) method. This Desktop application can help the owner to organtize and processing sales data effectively and efisienly. Beside that, the owner also can do supervision on any input and output activity whenever and wherever they were, so its become more fleksibility onto arrangement and created a neater selling management.