Question

If i create a control on the fly, as below

private void button10_Click(object sender, EventArgs e)
{
    CheckedListBox CheckedListBox1 = new CheckedListBox();
    CheckedListBox1.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(224)), ((System.Byte)(192)));
    CheckedListBox1.ItemHeight = 16;
    CheckedListBox1.Location = new System.Drawing.Point(12, 313);
    CheckedListBox1.Name = "CheckedListBox1";
    CheckedListBox1.Size = new System.Drawing.Size(168, 244);
    CheckedListBox1.TabIndex = 0;
    Controls.Add(CheckedListBox1);

    Button button12 = new Button();
    button12.Location = new Point(900, 500);
    button12.Size = new Size(75, 23);
    button12.Click += new System.EventHandler(button12_Click);
    button12.Name = "button12";
    button12.Text = "Toggle All";
    Controls.Add(button12);
}

what is the best way to reference that control from a function outside of the local scope? would it be best creating a static class to somehow hold a reference to the control that can be accessed outside the local scope or is there a findcontrol function for winforms ( i think findcontrol is just for web).

i want

private void button12_Click(object sender, EventArgs e)
{
    for (int i = 0; i <= (CheckedListBox1.Items.Count - 1); i++)
    {
        if (CheckedListBox1.GetItemCheckState(i) == CheckState.Checked)
        {
            CheckedListBox1.SetItemCheckState(i, CheckState.Indeterminate);
        }
        else if (CheckedListBox1.GetItemCheckState(i) == CheckState.Indeterminate)
        {
            CheckedListBox1.SetItemCheckState(i, CheckState.Checked);
        }
    }
}

to be able to work but im going wrong because of scope? pls help a newbie

thanks

Answer 1

I’m assuming the two functions button12_Click and button10_Click are members of a From class. In this case, your should make your CheckListBox1 and button12 members of the From class. That way, the button12_Click will be able to reference the controls you will have created.

 public partial class Form1 : Form
 {
      CheckedListBox CheckedListBox1 = null;
      Button button12 = null;


      private void button10_Click(object sender, EventArgs e) 
      {
        CheckedListBox1 = new CheckedListBox();
        CheckedListBox1.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(224)), ((System.Byte)(192)));
        CheckedListBox1.ItemHeight = 16;
        CheckedListBox1.Location = new System.Drawing.Point(12, 313);
        CheckedListBox1.Name = "CheckedListBox1";
        CheckedListBox1.Size = new System.Drawing.Size(168, 244);
        CheckedListBox1.TabIndex = 0;
        Controls.Add(CheckedListBox1);

        button12 = new Button();
        button12.Location = new Point(900, 500);
        button12.Size = new Size(75, 23);
        button12.Click += new System.EventHandler(button12_Click);
        button12.Name = "button12";
        button12.Text = "Toggle All";
        Controls.Add(button12);
    }

    private void button12_Click(object sender, EventArgs e)
    {
        for (int i = 0; i <= (CheckedListBox1.Items.Count - 1); i++)
        {
            if (CheckedListBox1.GetItemCheckState(i) == CheckState.Checked)
            {
                CheckedListBox1.SetItemCheckState(i, CheckState.Indeterminate);
            }
            else if (CheckedListBox1.GetItemCheckState(i) == CheckState.Indeterminate)
            {
                CheckedListBox1.SetItemCheckState(i, CheckState.Checked);
            }
        }
    }

 }