I'm working on something in C# and I can't figure out how to make my Select Directory button open a folder browser and let me select the folder to...

I'm working on something in C# and I can't figure out how to make my Select Directory button open a folder browser and let me select the folder to populate it into the text box as a path. I'll be using this to populate and analyze files in the folder but I know more less how to do that.

I 'm currently trying to create the directoryinfo object but its not right. How do I make this work or where could I look to find it?