How to bulid a simple compiler in c#?

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C#

Hello everyone
I need a little help here
i got a simple source language with simple rules
the general look of the program

Program my-prog; // any program start with the keyword program

var // just one time to start stating the variables

x:datatype // this part is for intial variables

X,y:datatype // for two varibles

Begin // now we start the dosy of the program

.
.
.
.
End

the Instructions

1- if(condition) then

statment; // one instruction only

2- if(condition)

Begin
statment1;
statment2;
End

else

Begin
.
.
.
End // in case of more than one instruction

3- while(condition) do
Begin
.
.
.
End

4- for counter=val1 to val2 do
Begin
.
.
.
End

5- var_name := exp;

6- read(x); // for reading x is a variable
7- readln(x);
8- write(exp);
9- writeln(exp);

there is a ready functions in this language such as:

sin, cos, tan, square, sqrt, max, min.

mathimatical things:

+, +=, -, -=, *, *=, /, /=

comparing things:

>, <, <=, >=, =, !=


first step is the lexical analysis which read a stream of characters and returns tokens

then semantic analysis

If anyone can help it would be cool otherwise thanks