C# Discussion Boards - CodeProject

28-Oct-05 14:26

>>created a checkbos and a button like this:
CheckBox checkBox2 = new CheckBox();
checkBox2.Text="Test";
checkBox2.Location = new System.Drawing.Point(16,64);
//create the button
btnPF.Text="Create";
btnPF.Location = new System.Drawing.Point(208,208);
btnPF.Click += new System.EventHandler(btnPF_Click);
>> on the event I place this code
if(checkBox2.Checked==true)
MessageBox.Show("checked","Info";
else
MessageBox.Show("Not checked","Info");
>>problem, even if the box is checked, the message is always "Not Check"
>>Any help is greatly appreciated

jmac714228-Oct-05 15:31

28-Oct-05 15:31

First, you don't need the first 8 lines of code you posted, it's automatically generated by the VS.NET designer, and the default control code is generated by double-clicking the control in the designer view. Other than that, the control should read something like this:

<br />
public void btnPF_Click(object sender, EventArgs e)<br />
{<br />
    if (checkBox2.Checked)    // This method defaults to true<br />
    {<br />
        MessageBox.Show("Checked", "Info");    // You didn't close the method here<br />
    }<br />
    else<br />
    {<br />
        MessageBox.Show("Not checked", "Info");<br />
    }<br />
}<br />

So, in short, use the VS.NET designer to generate any code except for the code inside the main scope in the code above (the '{}' that is opened first and closed last), using the the drag and drop to the designer method to make the controls, and double-clicking them to add code to them.

picasso228-Oct-05 17:27

28-Oct-05 17:27

Thank you jamac7142;
I did not explained correctly so let me try again:
I have one button (btnCreate)on form, when it is clicked, it creates three components, a panel, checkbox and another button (btnPF). When the new button (btnPF)is clicked, it checks if the checkbox is checked or not.
So the 8 lines are part of the first button (btnCreate).

jmac714228-Oct-05 18:14

28-Oct-05 18:14

Try this then:

<br />
private void btnCreate_Click(object sender, EventArgs e)<br />
{<br />
    Panel panel1 = new Panel();<br />
    CheckBox cB1 = new CheckBox();<br />
    Button btnPF = new Button();<br />
<br />
    /* Control Properties. you'll have to fill in the locations and sizes by replacing the x and y values I substituted instead of integers, as well as any different text */<br />
    panel1.Location = new Point(x,y);<br />
    panel1.Size = new Size(x,y);<br />
    <br />
    cB1.Location = new Point(x,y);<br />
    cB1.Size = new Size(x,y);<br />
    cB1.Text = "checkBox";<br />
   <br />
    btnPF.Location = new Point(x,y);<br />
    btnPF.Size = new Size(x,y);<br />
    btnPF.Text = "button";<br />
<br />
    // Add them:<br />
    Controls.Add(panel1);<br />
    Controls.Add(cB1);<br />
    Controls.Add(btnPF);<br />
<br />
    // Add btnPF's event:<br />
    this.btnPF.Click += new System.EventHandler(this.btnPF_Click);<br />
}<br />
private btnPF_Click(object sender, EventArgs e)<br />
{<br />
    if (cB1.Checked)<br />
    {<br />
        MessageBox.Show("Checked", "Info");<br />
    }<br />
    else<br />
        MessageBox.Show("Unchecked", "Info");<br />
}<br />

-- modified at 0:16 Saturday 29th October, 2005

picasso228-Oct-05 21:23

28-Oct-05 21:23

You code is just like mine with the exception of the line adding the controls:

panel1.Controls.AddRange(new Control[]{cB1,btnPF});
I changed to your sugetion, just incase
// Add them:
Controls.Add(panel1);
Controls.Add(cB1);
Controls.Add(btnPF);

but
Still no luck.
somehow does not like the "if (cB1.Checked)...."
it alsways displays the message under "else"

jmac714228-Oct-05 21:37

28-Oct-05 21:37

Try this:

<br />
if (checkBox1.Checked)<br />
{<br />
    MessageBox.Show("Checked");<br />
}<br />
else<br />
{<br />
    MessageBox.Show("Unchecked");<br />
}<br />

picasso229-Oct-05 11:59

29-Oct-05 11:59

Thank you jmac7142 for helping me troubleshoot this problem.
An tried the MessageBox as you suggested.
still no luck.
I am planning to use about five checkboxes but I can even make it work with one. May be I should the "switch" insted of the "if-else"

jmac714229-Oct-05 15:27

29-Oct-05 15:27

My last post worked on my machine though...

Viewing large images with zoom

mav.northwind29-Oct-05 20:25

mav.northwind

29-Oct-05 20:25

Guessing from your recent question about the NullReferenceException, could it be that you've messed up the controls you're working with, i.e. create one CheckBox and then test the wrong one for its Checked state?

You don't have to try switch instead of if-else, they're completely equivalent and will definitely not be the reason for your problem.

Try setting a breakpoint at where you query your CheckBox and take a look at its properties. Perhaps you can find the reason there.

Regards,
mav

Libor Tinka28-Oct-05 12:50

Libor Tinka

28-Oct-05 12:50

How to solve viewing images with zoom in C# like in very common graphic editors? There you just open an image, and then view desired detail of an image (using Magnyfying glass tool). When you zoom it in, you see pixelated part of image and smaller scroll bars, so you are still able to move image.

In C#, when I try to stretch 3 megapixel image to 800%, an ugly memory problem appears. Why? I'm not resizing the image, just stretching PictureBox to see zoomed image. But this technique doesn't work. Does anybody know how to solve this? I'm lost with this task Frown | :(

Reading a binary file with multiple headers

jmac714228-Oct-05 12:15