Question

I am trying to get my head around OO and C# and although I have searched I can’t see an answer so, hopefully someone here can help.

I have a form (public Form_DaRT_BOM_Main()) and on it a text box (textBox1). These reside in MSVS2010 generated files.

namespace DaRT_BOM
{
  public partial class Form_DaRT_BOM_Main : Form
  {
    public Form_DaRT_BOM_Main()
  }
}

I have my own function in Program.cs that resides in

public static class GeneralFunctions
{
}

I am trying to write text into the textbox but can’t see how this should be addressed.

Currently I have:

public static String SplitFile(String FileToSplit)
  {
    String line;
    using (StreamReader reader = new StreamReader(FileToSplit))
    {
      line = reader.ReadLine();
      Form_DaRT_BOM_Main.textBox1 = line;
    }

    return null;
  }

Prior to trying to use the textbox for output I was testing using a MessageBox and that worked okay.

What I get now is a compilation error:

An object reference is required for the non-static field, method, or property

Which suggests I am not addressing the textbox correctly.

Please forgive the Mickey Mouse element but I am still trying to understand… old-dog and new tricks syndrome.

Thanks in anticipation.

Steve.

Answer 1

You need a reference to the form or access textbox1 within the form in some event for example or in the constructor. For example:

//inside the form (in an event or constructor).
this.textbox1.Text = GeneralFunctions.SplitFile(some_parameter_here);

If you want to access the form from a static class – make it singleton or make some static property which will hold reference to the actual form.