Get dictionary of const name and value [duplicate]

This question already has an answer here:

• How can I get all constants of a type by reflection? 5 answers

I have a class like:

public static class State 
{
    public const int Open = 1;
    public const int InProgress = 2;
    public const int Rejected = 3;
    public const int OnHold = 4;
}

I need to create dictionary that will contains all const with values. How can I get dictionary<string, string> with values:

Key       Value
--------------
Open        1
InProgress  2
Rejected    3
OnHold      4