CODEWITHSUNDEEP
c#mysql
Kaan Öztüzün
Kaan Öztüzün

Reputation: 25

Data Passing Between Two Form with SQL

I'm trying to text passing another form using reader. This code is from Form1.

if (count == 1) // IF Ok.
            {
                userLabel.Text = myReader[0].ToString(); // SHOW THE USERNAME
                loginSuccessTimer1.Enabled = true; // FOR TIMER
                LoginFormSuccessBG loginSuccess = new LoginFormSuccessBG();
                loginSuccess.Show(); //LoginSuccess SHOW FORM
            }

This code from Form2. I want to show text in this form from Form1.

 private void button2_Click(object sender, EventArgs e)
    {
        userLabel2.Text = loginForm.userLabel.Text;
    }

But if i click the button2 on Form2; i'm taking this error on Visual Studio:

An unhandled exception of type 'System.NullReferenceException' occurred in Launcher.exe Additional information: Object reference not set to an instance of an object.

I've set the userLabel to public and tried this on Form2.

userLabel2.Text = loginForm.userLabel.ToString();

But it's not working. Always giving this error.

Upvotes: 2

Views: 94

Answers (2)

Telos
Telos

Reputation: 1129

This should work, I just did it in a test app.

userLabel2.Text =
    (Application.OpenForms["yourForm1"] as yourForm1).userLabel.Text;

Upvotes: 1

Kemal Kefeli
Kemal Kefeli

Reputation: 2284

You can pass the Form1 as a parameter to Form2's constructor. Then, if you did userLabel public, so you can access it from Form2. Here is an example:

Form1 code:

public Form1()
{
    InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
    Form2 frm = new Form2(this);
    frm.Show();
}

Form2 code:

Form1 form1;
public Form2(Form1 sender)
{
    InitializeComponent();
    form1 = sender;
}

private void button1_Click(object sender, EventArgs e)
{
    string text = form1.label1.Text;
}

Upvotes: 1

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