how to sort string length

Hi Shamboo,

I think you want to get 25 characters from the string, string may have 25 more or less characters.. If I am right, you can try this

So here is what I have tried, which might be useful and keep it as refernce

string encodeStr = @"!#$%&'()*+,-./0123456789:;<=>?             @ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~";

string decodeStr = @"@ABCDEFGHIJKLMNO0123456789:;<=>?           pqrstuvwxyz{|}~!#$%&'()*+,-./`abcdefghijklmnoPQRSTUVWXYZ[\]^_";

protected void Page_Load(object sender, EventArgs e)
        {
            string schoolName = "RMHSSchool";
            string schoolAddress = "MaduraiSchool";
            string regId = "101";
            string versionNum = "1.0";
            string softwareType = "ASP";
            string finalCipherText = string.Empty;
            string finalRawText = string.Empty;

            //25 Characters generation using custom encryption method
            finalCipherText = encodeString(schoolName.Substring(0, 8)) + encodeString(schoolAddress.Substring(0, 8))+ encodeString(regId.Substring(0, 3)) + encodeString(versionNum.Substring(0, 3)) + encodeString(softwareType.Substring(0, 3));

            //25 Characters generation using custom decryption method
            finalRawText = decodeString(schoolName.Substring(0, 8)) + decodeString(schoolAddress.Substring(0, 8)) + decodeString(regId.Substring(0, 3)) + decodeString(versionNum.Substring(0, 3)) + decodeString(softwareType.Substring(0, 3));

            //Getting the values from actual input and binding as single string
            string compareFinal = schoolName.Substring(0, 8) + schoolAddress.Substring(0, 8) + regId.Substring(0, 3) +
                                  versionNum.Substring(0, 3) + softwareType.Substring(0, 3);


            if (decodeString(finalCipherText) == compareFinal) //Just for re-checking the input and cipher text
            {
                //Decryption successfull
            }
            else
            {
                //Decryption failed
            }
        }

        //Custom Encryption method
        protected string encodeString(string rawText)
        {
            string cipherText = string.Empty;
            foreach (char rawChar in rawText)
            {
                cipherText += encodeStr.ElementAt(decodeStr.IndexOf(rawChar));
            }
            return cipherText;
        }

        //Custom Decryption method
        protected string decodeString(string cipherText)
        {
            string rawText = string.Empty;
            foreach (char cipherChar in cipherText)
            {
                rawText += decodeStr.ElementAt(encodeStr.IndexOf(cipherChar));
            }
            return rawText;
        }

You need to take care of validating the length of every string and other sort of validations.
Finally you will get 25 characters unique ID as per your requirement.
The above code is only for reference dont rely on it, customize the way you want and make it more secure.

Hope this helps you better

Regards,
RK

if you just want to check the length of the string write

if(mystringh.Trim().Length>=25)
{
    //Do Work
}

that will give you the length of string.