Question

I’m trying to update a text box from a class called ‘hex’ to the main form. Within the class ‘hex’ I have the following code:

        Main m = new Main();
        m.updateTextBox(convertedHex);

the code passed the variable to the main form to the method called ‘updateTextBox’ as shown below:

    public void updateLog(string input)
    {
        textBox2.AppendText(input);
    }

Sorry if this seems like a silly questions I have been stuck for a while, all the links on my google searches are now purple so I was hoping if someone could explain this to me. Many thanks.

Answer 1

Add this kind of method inside your Main class where textBox is created and call it from outside.

Lets say you added the code in your Program.cs class to start new

    // Add this code in Program.cs (or similar where you start the gui
    public static readonly Main MainLogWindow = new Main();

    // Add this code in Main.cs class 
    private delegate void NameCallBack(string varText);
    public void UpdateTextBox(string input) {
        if (InvokeRequired) {
            textBox.BeginInvoke(new NameCallBack(UpdateTextBox), new object[] {input});
        } else {
            textBox.Text = input;
            // textBox.Text = textBox.Text + Environment.NewLine + input // This might work as append in next line but haven't tested so not sure
        }
    }

Call it like: Program.MainLogWindow.UpdateTextBox("test test"); from anywhere assuming that you have MainLogWindow open

This will also allow you to call updates from within other threads.