Range Validation with Excel using C#
I've been looking on the internet for 4 hours and I just can't do it. My objectives : create a combo where I can sort my items and when I click on one of them, the item appears alone. In Excel, easy to do, but I can't do it in C#. I found this answer : Other topic , but I can't understand where the "this.Controls" comes from. Thanks for your help if you want to use a validation for that purpose the following method was written by me to add a Validation and a small Infobox that appears when the user clicks on the cell: /// <summary> /// Adds a small Infobox and a Validation with restriction