returning a number to it's double value : i'm creating a program to evaluate the number inputted for example i inputted 5 the function should be able to return the number 5 = 500 or 4 = 400, 6 = 600, 10 = 1000 and so on.

this is what i've done so far.

     public int NumberEval(int theNumber)
            {
                int theResult = 0;
                switch (theNumber)
                {
                    case 0:
                        theResult = 1;
                        break;
                    case 1:
                        theResult = 1;
                        break;
                    case 2:
                        theResult = 200;
                        break;
                    case 3:
                        theResult = 300;
                        break;
                    case 4:
                        theResult = 400;
                        break;
                    case 5:
                        theResult = 500;
                        break;
                    case 6:
                        theResult = 600;
                        break;
                    case 7:
                        theResult = 700;
                        break;
                    case 8:
                        theResult = 800;
                        break;
                    case 9:
                        theResult = 900;
                        break;
                    case 10:
                        theResult = 1000;
                        break;
                    case 11:
                        theResult = 1100;
                        break;
                    case 12:
                        theResult = 1200;
                        break;
                    case 13:
                        theResult = 1300;
                        break;
                    case 14:
                        theResult = 1400;
                        break;
                    case 15:
                        theResult = 1500;
                        break;
                    case 16:
                        theResult = 1600;
                        break;
                    case 17:
                        theResult = 1700;
                        break;
                    case 18:
                        theResult = 1800;
                        break;
                    case 19:
                        theResult = 1900;
                        break;
                    case 20:
                        theResult = 2000;
                        break;
                    default:
                        break;
                }
                return theResult;
            } 

but my problem is that what if i entered 50 then it should be 5000..is there a way to shortcut this method because i dont want to manually encode every in switch case. or even a mathematical equation for this?. thank you for any help.