Question

I’m new to C#, so this may be a basic question. What I need to do is put an array such as the one below in a class library and then make a call to it. So I’d want the appropriate picture to appear via the class and this array. I know there’s a much simpler way to make certain pictures appear, but this is a requirement for the project. It’s an asp.NET website in C#.

string[] PictureArray;

PictureArray = new string[3];
PictureArray[0] = "~/pics/grl.jpg";
PictureArray[1] = "~/pics/pop.jpg";
PictureArray[2] = "~/pics/str.jpg";
PictureArray[3] = "~/pics/unk.jpg";

EDIT (also in comment):
I’m trying to get the picture from the array to show up in an image box upon a button click like this:

protected void Button1_Click(object sender, EventArgs e) { 
   Class1 name = new Class1(); 
   this.Image1.ImageUrl = name.GetPic(); 
}

Obviously just the name.GetPic() isn’t going to do anything, it’s throwing an error actually.

EDIT2: Sorry for the confusion, I just realized I can edit and comment. I’ve got the array in the class properly setup, now I need to access it (read above edit).

Answered

string[] pictures = work.GetPictures();
Image1.ImageUrl = pictures[0];

is all that I needed to see, thanks Zyphrax

Answer 1

ok, it seems that you’ve put some effort into this.
I think you’re looking for something like the sample below.

I’ve added comments to help you understand what’s going on.

One of the classes in your class library:

// Define a class called HomeWork, make it accessible to other
// classes in other namespaces
public class HomeWork {

  // Define a method called GetPictures, no incoming arguments,
  // returns a string[]
  public string[] GetPictures() {

    // Create a new instance of a string array
    string[] pictures = new string[4];

    // Fill the string array with a couple of strings
    pictures[0] = "~/pics/grl.jpg";
    pictures[1] = "~/pics/pop.jpg";
    pictures[2] = "~/pics/str.jpg";
    pictures[3] = "~/pics/unk.jpg";

    // Return the string array
    return pictures;
  }
}

How to call the method on that class:

// Create a new instance of the HomeWork class
HomeWork work = new HomeWork();

// Call the GetPictures method
work.GetPictures();

Please ask your teacher to explain it into more detail.
We can’t teach you years of programming experience in one SO question 🙂

EDIT: In response to your second question

Option 1: use the array that was returned by GetPictures:

HomeWork work = new HomeWork();
string[] pictures = work.GetPictures();

Image1.ImageUrl = pictures[0];
Image2.ImageUrl = pictures[1];
Image3.ImageUrl = pictures[2];
// etc..

Option 2: create an overload for GetPictures that accepts an index

public string[] GetPictures() {
    // This method remains unchanged
}

public string[] GetPictures(int index) {
   // Get the string array from GetPictures
   string[] pictures = GetPictures();

   // Return a specific index
   return pictures[index];

   // As you can see, this method might be
   // dangerous to use, because someone could
   // ask for an invalid index causing an
   // IndexOutOfRangeException
}

HomeWork work = new HomeWork();
Image1.ImageUrl = work.GetPictures(0);
Image2.ImageUrl = work.GetPictures(1);
Image3.ImageUrl = work.GetPictures(2);

The samples above are to illustrate how C# works.
It would be inefficient to use it this way in a business application.