how to get remove last two digits if it 11 or 12

Try:

string s = "30888293212";
if ((s.EndsWith("11") || s.EndsWith("12")) && s.Length > 9)
    s = s.Remove(9);

use this for get perfect result


string strVal = "30888293211";
strVal = strVal.Length > 9 ? (strVal.EndsWith("11") ? strVal.Substring(0, 9) : (strVal.EndsWith("12") ? strVal.Substring(0, 9) : strVal)) : strVal;
Response.Write(strVal + "");

strVal = "30888293212";
strVal = strVal.Length > 9 ? (strVal.EndsWith("11") ? strVal.Substring(0, 9) : (strVal.EndsWith("12") ? strVal.Substring(0, 9) : strVal)) : strVal;
Response.Write(strVal + "");

strVal = "30888293216";
strVal = strVal.Length > 9 ? (strVal.EndsWith("11") ? strVal.Substring(0, 9) : (strVal.EndsWith("12") ? strVal.Substring(0, 9) : strVal)) : strVal;
Response.Write(strVal + "");

Hi.

In my project I want to remove last two digits if it is greater than nine and it has 11 or 12.

At there, what the "nine" means?

I realized like this.
First: "Nine" means every last two digits's each value. For example if numerical string is "23328391829", last two digits 2 and 9's each value is greater than nine. If it so, number can be 0~9 and there is no other number greater than 9.

Second, "Nine" means last two digits's value. For example, if numerical string is "34234293819", last two digits's value is "19". If this value is greater than 9, you have to remove this. If it is so, there is no need to say that "..... it has 11 or 12". Because 11 and 12 is also greater than 9.

Among them, which one is your destination?

I can solve this problem under your detailed answers. Thank you.

private long trimLastTwoDigits(object objValue)
{
      long lRet = 0;
      if (objValue is String)
      {
           if (long.TryParse(objValue as String, out lRet) == false)
           return -1;
      }

      if (lRet % 100 == 11 || lRet % 100 == 12)
           lRet = lRet / 100;

       return lRet;
}

Well, you can get number which you want.

If you want to process your input value with string, see below.

private string trimLastTwoDigits(object objValue)
{
    string str = objValue as String;
    int nLen = str.Length;

    str = (str.EndsWith("11") || str.EndsWith("12")) ? str.Substring(0, nLen - 2) : str;

    return str;
}