how get integer only and remove all string in C# [duplicate]

Answer 1

Check out this blog post: http://weblogs.asp.net/sushilasb/archive/2006/08/03/How-to-extract-numbers-from-string.aspx

A simple program that extracts the number from the String using a regular expression.

class Program
    {
    static void Main(string[] args)
    {
      Console.WriteLine(ExtractNumbers("( 01 - ABCDEFG )"));    // 01
      Console.ReadLine();
    }

    static string ExtractNumbers(string expr)
    {
        return string.Join(null, System.Text.RegularExpressions.Regex.Split(expr, "[^\\d]"));
    }
}

Hope this helps!