How to remove first 10 characters from a string?

str = str.Remove(0,10); Removes the first 10 characters

or

str = str.Substring(10); Creates a substring starting at the 11th character to the end of the string.

For your purposes they should work identically.

str = "hello world!";
str.Substring(10, str.Length-10)

you will need to perform the length checks else this would throw an error

Substring is probably what you want, as others pointed out. But just to add another option to the mix...

string result = string.Join(string.Empty, str.Skip(10));

You dont even need to check the length on this! :) If its less than 10 chars, you get an empty string.

Substring has two Overloading methods:

public string Substring(int startIndex);//The substring starts at a specified character position and continues to the end of the string.

public string Substring(int startIndex, int length);//The substring starts at a specified character position and taking length no of character from the startIndex.

So for this scenario, you may use the first method like this below:

var str = "hello world!";
str = str.Substring(10);

Here the output is:

d!

If you may apply defensive coding by checking its length.