[c#] To get specific part of a string in c#

I have a string

string a = "abc,xyz,wer";

Now, I need a part of this string like

string b = "abc";

I need everything before the first comma.How shall I get it?

If you want to get the strings separated by the , you can use

string b = a.Split(',')[0];

You can use Substring:

string b = a.Substring(0,3);

Your question is vague (are you always looking for the first part?), but you can get the exact output you asked for with string.Split:

string[] substrings = a.Split(',');
b = substrings[0];
Console.WriteLine(b);

Output:

abc

To avoid getting expections at run time , do something like this.

There are chances of having empty string sometimes,

string a = "abc,xyz,wer";
string b=string.Empty;

if(!string.IsNullOrEmpty(a ))
{
  b = a.Split(',')[0];
}