Transfer data from Form2 to Form1 is throwing System.Nullreferenceexception

Question

I have two forms form1 and form2 and I want to transfer the value from form2 to form1. Form1 has a textbox where I want the value from Form2 Form2 has a button on its click the value gets from textbox on form2 to the textbox on form1

Here is my code :

Form2.cs

private Form1 HandleToForm2;

public Form2(Form1 frmHandle2)
    {

        HandleToForm2 = frmHandle2;
        InitializeComponent();


    }

private void update_Click(object sender, EventArgs e)
    {  

            HandleToForm2.WriteToTextBox2(textBox2.Text);
            this.Hide();
    }

Form1.cs

public void WriteToTextBox2(string inputText1)

    {

       this.textBox8.Text = inputText1;

     }

Dont know why its throwing NullReference Exception "Object not set to an instance of an object

 HandleToForm2.WriteToTextBox2(textBox2.Text); //this line throws this exception

Thanks in advance :-)

either HandleToForm2 or textBox2is null - use the debugger to find out which. — Hans Keﬆing
We will need to see the code where you show your Form2. Maybe the key will be there ;) — Pavel Donchev

Hoang Nguyen Hoang Nguyen · Accepted Answer · 2011-11-24T07:00:17

0

votes

You haven't initialized the HandleToForm2 so it is null.

Transfer data from Form2 to Form1 is throwing System.Nullreferenceexception

2 Answers