Remove data present in comments ex.,"//" or "/* */"

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C#

C#4.0

Hallo can any one help me please,

i want to delete data present in Comments

Forexample:

//#define 0
//#define 1
/*#define 2*/
/*#define 3
#define 4*/
#define 5
/* abcd

*/

// efgh



// #define 6
#define 7
/* #define 8
#define 9
// #define 10

output should be:
#define 5
#define 7
#define 9

i tried thisway,

string line; string str;
StringBuilder sb = new StringBuilder();

// Read the file and display it line by line.
using (System.IO.StreamReader file = new System.IO.StreamReader("FilePath"))
{
while ((line = file.ReadLine()) != null)
{
if (line.Contains("#define"))
{

str = line;

sb.AppendLine(line.ToString());


}
}
}
str = sb.ToString();


string pattern = @"(//[\t|\s|\w|\d|\.]*[\r\n|\n])|([\s|\t]*/\*[\t|\s|\w|\W|\d|\.|\r|\n]*\*/)|(\<[!%][ \r\n\t]*(--([^\-]|[\r\n]|-[^\-])*--[ \r\n\t%]*)\>)";


Regex rx = new Regex(pattern, RegexOptions.IgnoreCase);
MatchCollection mc = rx.Matches(str);

foreach (Match m in mc)
{

str = str.Replace(m.Value, "");
MessageBox.Show(str);
}

but am not able to read all till file end, it reads upto #define 10 , there is a one line empty ,its stopping there, i want to read all data between #define and delete comment's data, thanks