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C# subtraction of strings [closed]

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I am sorry for that bad Title, but basicaly my problem is really simple. I got 1 string which is basic alphabet and the second string which is gonna be part of the alphabet (8 characters) which user will fill up by himself. If 2 characters are the same, they will get removed and then rest of characters will be in the TextBox3. could someone pls help me ?
string alphabet = "abcdefghijklmnopqrstuvwxyz_*";
string special = TextBox2.Text;

I assume you want to check the existence of substring and remove from the parent string, Try this
string alphabet = "abcdefghijklmnopqrstuvwxyz_*";
string special = textBox2.Text;
if (alphabet.ToLowerInvariant().Contains(special))
{
textBox3.Text = alphabet.Replace(special, "");
}

How to String Format [closed]

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I've an array of strings below and wanted to format like the followings, what is the best way of doing that? Thanks in advance.
line[0] = "This is line one two tree";
line[1] = "This is Abc Cde";
line[2] = "This is cjdj";
I want it to format to display like this
This is line one two tree
This is Abc Cde..........
This is cjdj.............

You can use the string.PadRight() method, coupled with determining which of the array of strings is the widest:
var width = line.Max(l => l.Length);
foreach (var l in line)
Console.WriteLine(l.PadRight(width, '.'));

You could use:
var output = string.Join(Environment.NewLine, line.Select(l => l.PadRight(line[0].Length, '-').ToArray());

Use string.PadRight to pad each string, up to the specified length, with instances of a specified character.

Use PadRight:
http://msdn.microsoft.com/en-us/library/system.string.padright.aspx
e.g.
int len = line[0].Length;
Console.WriteLine(line[0]);
Console.WriteLine(line[1].PadRight(len,"."));
Console.WriteLine(line[2].PadRight(len,"."));

How to change the decimal to 12 digit string [closed]

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How to change the double (currency) to 12 digit in c# toString();
For example
12.50 => 000000001250

Try this:
string value = ((decimal)(12.50 * 100)).ToString().PadLeft(12, '0');

int a = (int)(12.50 * 100);
Console.WriteLine((a).ToString("D12"));

Try this
string formattedValue = value.ToString("000000000000");
value being the input and formattedValue as the output.

Print Duplicate Items using LINQ [closed]

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I want to print duplicate items using LINQ.
e.g. I want to print 1 at 10 times.
Here 1 is a string and 10 (Dynamic Number) is the number of times I want to print this string.
How can I do this?

You can use this constructor overload:
int count = 10;
string s = new String('1', count);

If you really wanted to use Linq, you could use Enumerable.Repeat:
int copies = 10;
foreach(var s in Enumerable.Repeat("1", copies))
{
Console.WriteLine(s);
}
But for that matter, a simple for-loop would work too:
int copies = 10;
for(int i = 0; i < copies; i++)
{
Console.WriteLine("1");
}

Trimming and Removing text from string? [closed]

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I want to trim a string and remove all the words that occur after a certain word.
For example - If the string contains 'very' text
string mySentence=" Today is very nice day! ";
if (mysentence.Contains(very))
{
//remove everything that starts with 'very' until rest of the line..
}
result should be:
Today is

First you split using the required word
string[] splits = mysentence.Split("very");
Since you've already made certain that "very" is inside the string, this will get you two strings. You want the first one (the split before the "very"). You need to trim the extra space from that one so:
string result = splits[0].Trim();

Try this
string mySentence = " Today is very nice day! ";
if (mySentence.Contains("very"))
{
mySentence = mySentence.Remove(mySentence.IndexOf("very")).Trim();
}