Q:

Splitting only returns System.String[] instead of actual value

I've searched a while now and still haven't found anything.
My Problem is, I want to simply split a value, delivered from a Textbox
as soon as a 1 appears.
string t1 = textBox1.Text;
string[] split = t1.Split(new Char[] {'1'});

I'm delivering the value written in my variable into another Textbox.
Now my problem is, it won't display the stuff that comes after the 1, as it should in the split method. Instead it displays System.String[]. Anybody have some help ? 
Edit:
complete code part of my program:
 {
                string t1 = textBox1.Text;
                string[] split = t1.Split(new Char[] { });
                textBox1.Text = split.ToString(); 
                if (split.Length == 2)
                    textBox4.Text = split[1];          

                url = "https://www.google.de/search?q=" + textBox3.Text + "&um=1&client=" + split[1] + "-a&rls=org.mozilla:de:official&hl=de&" + textBox2.Text + "=lnms&sa=X&ei=Re2YUd-RCYiC4gThw4GwAQ&ved=0CAkQ_AUoAA&biw=1920&bih=951

                textBox4.Text = url;
            }

A:

I think you are probably assigning the result to the textbox like this:
textBox2.Text = split.ToString();

The ToString() will be converting the string[] split array to a string, which by default just returns the name of the type, in this case System.String[].
In order for you to be able to use it, the split array should have at least two items in it; namely, all the substrings in the textbox that were separated by / characters.
I suspect you want to use all the characters after the / like so:
if (split.Length >= 2)
    textBox2.Text = split[1];

String.Split() will work like this:
If your input text was: "ABCD/EFGH", then split would be:
split[0] == "ABCD";
split[1] == "EFGH";

And if your input text was: "ABCDEFG", then split would be:
split[0] == "ABCDEFG"; // There is no split[1]

And if your input text was: "AB/CD/EF", then split would be:
split[0] == "AB"
split[1] == "CD"
split[2] == "EF"

Note that these last two cases both have split.Length != 2.
What do you want to do for the last case, where there are two (or even more) / characters in the input?

[EDIT] Looking at your last update, this line of code is wrong:
textBox1.Text = split.ToString();

It should be:
if (split.Length > 0)
    textBox1.Text = split[0];

Read the first part of my answer above for an explanation about what split.ToString() does!
Also, this line is wrong:
string[] split = t1.Split(new Char[] { });

It should be 
string[] split = t1.Split(new [] {'/'});

You didn't specify which character to split on. From your comments below this anwser, I assume you actually want to split on '/'.
Finally! Your line starting with:
url = "https: ...

uses split[1] so you need to protect it with an if:
if (split.Length > 1)
    url = "https: ...
else
    url = "<DIDN'T WORK!>"; // Or something! :)

