How to convert a value to KeyCode ?

See more:

C#

string

I have non-english keyboard, also so instead of 1 of my keyboard i have +. When i press a key i get a string from KeyChar.ToString(), also "+" with non-english keyboard and "1" with english-keyboard.
How can i convert this string to KeyCode Keys.D1 ??
With the condition when the parameter will be one of them, i always get the same result also Keys.D1 in format Keys ??

For example

private Keys ConvertToKeys(string s)
        {
             // code
        }
...

ConvertToKeys("+") // result Keys.D1
ConvertToKeys("1") // result Keys.D1

Thanx for your help !