NullReferenceException when adding buttons to Panel

Question

I am trying to add number of buttons in container of a Panel in window Form, my implementation is as follows:

protected override void Order_Click(object sender, EventArgs e)
{    
  Menu = new MenuForm();
  CatButtons = new Button[5];
  CatButtons[0] = new Button();
  CatButtons[0].Text = "ljjih";
  CatButtons[0].Click += new System.EventHandler(btn_Click);
  Menu.Cat_Panel.Container.Add(CatButtons[0]);
}

I keep getting System.NullReferenceException at the last line

Menu.Cat_Panel.Container.Add(CatButtons[0]);

Note : CatButtons and Menu are already declared globally

Who takes care to initialize the Cat_Panel inside the MenuForm()? — Steve, Mar 19 '15 at 22:50
But the button should be added to the Controls collection not to the Container. Right? — Steve, Mar 19 '15 at 23:04
`Note : CatButtons and Menu are already declared globally` declaring a variable is not the same as creating an instance — Ňɏssa Pøngjǣrdenlarp, Mar 19 '15 at 23:05

score 1 · Accepted Answer · answered Mar 19 '15 at 23:16

1

I Replaced :

Menu.Cat_Panel.Container.Add(CatButtons[0]);

with:

Menu.Cat_Panel.Controls.Add(CatButtons[0]);

And it Worked

answered Mar 19 '15 at 23:16

iwahdan

429
1
5
14

score 0 · Answer 2 · answered Mar 19 '15 at 22:51

0

I might be stating the obvious but does Cat_Panel exists as its not in the code snippet you show ? If it doesnt it would explain the Null Reference exception.

Worth checking the existance of that first.

answered Mar 19 '15 at 22:51

Ben Whyall

268
3
17

NullReferenceException when adding buttons to Panel

2 Answers2