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Convert from String to BigInteger in C# without cutting off leading zero's.

Working on a project where I need to do a bitwise & between two similar 168 character bitarrays. I am working in C# and when I attempt to convert from String to BigInteger, the leading zero's are being truncated. Is there anything I can do to save these characters?
Basically:
string bits = "000000000000000000000000000000000000000000000000000000000000000000001111111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
BigInteger bigIntBits = BigInteger.Parse(bits);
// I am being returned 1111111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
Anything will help. Thank you in advance.

You can simply do this:
string bits = "000000000000000000000000000000000000000000000000000000000000000000001111111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000";
// convert to big integer
var bigIntBits = BigInteger.Parse(bits);
int index = bits.IndexOf('1');
string backToString = new string('0', index) + bigIntBits.ToString();

how to convert a string into integer representation and change it back

I was wondering if there were any good methods to change a string into an integer representation and then be able to change the integer representation back to a string? There are a lot of ways to change a string to an integer representation by changing each character to ASCII, etc. but I was confused by how to change the ascii integer back into the fully formed string.
I am trying to represent my object of 3 strings into an integer so that I do not have to group by 3 string but just 1 integer.
For example an object of :
("hey",
"hello",
"goodbye")
would have an int representation of lets say 123423425 with some algorithm.
Then if possible I would like to be able convert that int from another algorithm back into
("hey",
"hello",
"goodbye")
Any help would be appreciated

int number = Int32.Parse("45");
string formatted = number.ToString()//add formatting if needed
You can go back and forth
Reference for format strings: http://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx
Convert char array to string
char[] charArray = {'1', '2', '3'};
String str = String.valueOf(charArray);

Trying to write hexadecimal value into a string in C#

I need to write a hexadecimal value into a string.
I'm using this:
int value;
long item = Convert.ToInt64(value); // this convert value to a hexadecimal
So I need to write this hexadecimal value into a string...
so, when I use ToString(), it's convert again into integer, I need to write hexadecimal value.

Not sure if I get your question, but you may want to try this:
int value;
string s = value.ToString("X"); // int to hexadecimal string
If you want to reparse it back to a long:
ulong ul = ulong.Parse(s, System.Globalization.NumberStyles.HexNumber); // hexadecimal string to unsigned int

int myInt = 1243;
string myHex = myInt.ToString("X"); // gives you hex
int myNewInt = Convert.ToInt32(myHex, 16); // back to int again.

Convert alphabetic string into Integer in C#

Is it possible to convert alphabetical string into int in C#? For example
string str = "xyz";
int i = Convert.ToInt32(str);
I know it throws an error on the second line, but this is what I want to do.
So how can I convert an alphabetical string to integer?
Thanks in advance

System.Text.Encoding ascii = System.Text.Encoding.ASCII;
string str = "xyz";
Byte[] encodedBytes = ascii.GetBytes(str);
foreach (Byte b in encodedBytes)
{
return b;
}
this will return each characters ascii value... its up to you what you want to do with them

To answer the literal questions that you have asked
Is it possible to convert alphabetical string into int in C#?
Simply put... no
So how can I convert an alphabetical string to integer?
You cannot. You can simply TryParse to see if it will parse, but unless you calculate as ASCII value from the characters, there is no built in method in c# (or .NET for that matter) that will do this.

You can check whether a string contains a valid number using Int32.TryParse (if your questions is about avoiding an exception to be thrown):
int parsed;
if (!Int32.TryParse(str, out parsed))
//Do Something

int to hex string

I need to convert an int to hex string.
When converting 1400 => 578 using ToString("X") or ToString("X2") but I need it like 0578.
Can anyone provide me the IFormatter to ensure that the string is 4 chars long?

Use ToString("X4").
The 4 means that the string will be 4 digits long.
Reference: The Hexadecimal ("X") Format Specifier on MSDN.

Try the following:
ToString("X4")
See The X format specifier on MSDN.

Try C# string interpolation introduced in C# 6:
var id = 100;
var hexid = $"0x{id:X}";
hexid value:
"0x64"

Previous answer is not good for negative numbers. Use a short type instead of int
short iValue = -1400;
string sResult = iValue.ToString("X2");
Console.WriteLine("Value={0} Result={1}", iValue, sResult);
Now result is FA88

Convert int to hex string
int num = 1366;
string hexNum = num.ToString("X");