Hello,

I am having a hard time deciphering why the IDE will give me a nullReference error when assigning a text string to a textBox.Text control. Following is the code (red highlight is the code where it'd say NullReferenceException unhandled). The debugger says this.TextBox1 = null. I compared this with other codes that I have doing the same thing and in those cases, the debugger would say textBox2 = {Text = ""}.

Any ideas why? In both cases, I right click on it and selected Find All References. I can see that both have the following:

- a line that declares the control

- a line that instantiate the control

- a line that adds the control to the form

- a few lines that set the properties of the control

and

- the line that assigns a string to it.

public partial class InformationBox : Form
{
public InformationBox(string displayInfo)
{
//textBox1.Text = displayInfo;
this.textBox1.Text = "hello";
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
this.Close();
}

public delegate void ControPass();
public ControPass controlPass;

private void button2_Click(object sender, EventArgs e)
{
if (controlPass != null)
{
controlPass();
}
this.Close();
}
}

Switch the code around - place InitializeComponent() method BEFORE setting the property of the textbox. It needs to initialize the controls on the form before you are allowed to access the controls

Switch the code around - place InitializeComponent() method BEFORE setting the property of the textbox. It needs to initialize the controls on the form before you are allowed to access the controls

Hello,

OMG. Can't believe I didn't notice that. Thanks Mr. MVP.