I am having a very difficult time in coming up with code for a DataGridView that will edit and process data for certain cells. I have attached a Screenshot that shows what cells (only the selected cells) will allow for User interaction. The functionality needs to allow the User to navigate only within that range of selected cells. This means whenever they hit the enter key, if the last selected cell has the focus, then when the Enter/Return Key is pressed, go the next row. On the last Row, column "Final Zero", upon hitting the Enter/Return Key, the cursor must be placed back in the 1st selected cell of the DGV (row 1 column 2). Only numeric values may be entered in the valid Cells. I don't know what else to try.
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