I am an experienced .net developer and can do you task on C# and .NET. Always provide all source codes and support for project in future.
I do similar work before and have all code to do this. I see you table. In some cases get coordinates for address not work.
For example for first address: "165 AVENUE ANDRE MALRAUX BP 60080, 54602, VILLERS LES NANCY CEDEX, France" google map not find coordinates. For second "11 RUE ST JEAN, 57600, GAUBIVING, France" it found. So not for all address in you file we can get coordinates.