Retrieve/Update EF Entity using string representation of column - code first

Is there anyway I can update an EF entity by only having the name of the column I need to update and its value:

So given the following data inside my webapi controller:

string colName = 'firstName';
string colValue = 'Sam';

In my EF data retrieval, instead of

var user = db.Users.Where(x => x.firstName == colValue);

can I do something like

var user = db.Users.Where(x => x.colName == x.colValue);

and the somehow update this give column, so something like:

user.colName = colValue;

instead of

user.firstName = colValue;

I have researched Reflection quite a bit but I'm not sure where to begin or if such a task is even possible.

Any pointers, recommendations or suggestions would be greatly appreciated!