Object reference not set to an instance of an object

[cyrus71]

i want to change values of controls in a User Control when i clikc on a button in a another user control, but i get following error:
Object reference not set to an instance of an object

Code:
//in My DownUserControl i call
protected void BTN_Click(object sender, EventArgs e)
{
TopUserControl TopUC = new TopUserControl();
TopUC.Title = "hello";
}

//and here I get the error in the TopUserControl:
public string Title
{
get { return TitleLable.Text }
set { TitleLable.Text = value }
}

 

[JurkMonkey]

Your problem is: you create the only instance of this control within your button click so it is disposed just after you write TopUC.Title = "hello";


what you need to do is put your usercontrol declaration outside of the function.

public class MyClass
{
private TopUserControl TopUC = new TopUsercontrol();

public MyClass()
{
InitializeComponents();
}

protected void BTN_Click(object sender, EventArgs e)
{
TopUC.Title = "hello";
}

// Then you can get the Title property from your usercontrol

private void button_click(object sender, EventArgs e)
{
MessageBox.Show(TopUC.Title);
}

}