What is the difference between string and String ? when is each one used ?

[gilit golit]

HI ! I am expirienced C++ programmer , but new to C#

1. What is the difference between string and String ? when is each one used ?

2. I tried to use "ToCharArra y" , because I need the text in simple characters array.

	private System.Windows.Forms.TextBox UserName ;
        char [] name1;
        name1 = new char [64];
        name1 = this.UserName.Text.ToCharArray();

But when tried to print it :

  MessageBox.Show( name1.ToString ());

It printed on the meesage box : "System.cha r [] " , which is not the text that is there.

MessageBox.Show( this.UserName.Text );

worked fine

3. I dont know what is wrong . ?

4. Is c# characters array is like C character array or not ?

Thanks

[GaryTexmo]

There is no difference between String and string, they're the exact same type.

A char array is a little different in C# than it is in C++. In C++, when you define a char array, the variable is actually a pointer to the memory location of the first item in that array but in C# it doesn't work like that. The ToString call on a char array outputs the Type instead of the contents of the array.

To output it, you'll have to loop through every element. It's also worth noting that strings in C# aren't null terminated, they are just contained by the array.

So while C++ code might look like this... (forgive my rusty syntax, been a while. I think you can do this...)

char *s = "this is my string!\0";
int i = 0;
while (s[i++] != NULL) cout << s[i];
cout << endl;

... in C# ...

char[] s = "this is my string!".ToCharArray()
for (int i = 0; i < s.Length; i++)
  Console.Write(s[i]);
Console.WriteLine();