Haw to change the background color of the checkbox in C#?

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I have a form with a question with 2 answers. And if i checked the right answer the background is changing in green, but if i wrong the background color is changing in red. But if i checked and after that i unchecked the the color is channging in transparent. Please Hellp

What I have tried:

i tried with

private void button1_Click(object sender, EventArgs e)
       {
           if (checkBox1.Checked == true && checkBox2.Checked == false)
           {
               if (checkBox1.Checked == true)
                   checkBox1.BackColor = System.Drawing.Color.Green;
               else checkBox1.BackColor = System.Drawing.Color.Transparent;
               if (checkBox2.Checked == true)
                   checkBox2.BackColor = System.Drawing.Color.Red;
               else checkBox2.BackColor = System.Drawing.Color.Transparent;
           }

but isn't workin good

Posted 17-May-17 6:03am

Member 13206672

Updated 17-May-17 9:59am

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Rob Philpott · Answer 1 · 2017-05-17T06:39:00

Solution 1

Not quite sure what you're trying to do, but the logic is wrong.

Code only executes when

if (checkBox1.Checked == true && checkBox2.Checked == false)

but then you have:

if (checkBox2.Checked == true)

Which can never happen.
...and

(checkBox1.Checked == true)

which always happens!

Posted 17-May-17 6:39am

Rob Philpott

Updated 17-May-17 6:40am

v2

Robert Raboud · Answer 2 · 2017-05-17T09:59:00

sounds like you should be using radio buttons not checkboxes.

Radio buttons are mutually exclusive.

private void radioButton_CheckedChanged(object sender, EventArgs e)
 {
     if (this.radioButton1.Checked)
     {
         this.radioButton1.BackColor = System.Drawing.Color.Green;
     }
     else
     {
         this.radioButton1.BackColor = System.Drawing.Color.Transparent;
     }
     if (this.radioButton2.Checked)
     {
         this.radioButton2.BackColor = System.Drawing.Color.Red;
     }
     else
     {
         this.radioButton2.BackColor = System.Drawing.Color.Transparent;
     }
 }

if you insist on using checkboxes you will need to know which one was clicked and will need to uncheck it first keeping this in the click event.

maybe best to have separate click events for each radio button to uncheck the other

private void cbCorrect_Click(object sender, EventArgs e)
{
    if (this.cbCorrect.Checked)
    {
        this.cbCorrect.BackColor = System.Drawing.Color.Green;

        this.cbWrong.Checked = false;
        this.cbWrong.BackColor = System.Drawing.Color.Transparent;

    }
    else
    {
        cbCorrect.BackColor = System.Drawing.Color.Transparent;
    }
}

private void cbWrong_Click(object sender, EventArgs e)
{
    if (this.cbWrong.Checked)
    {
        this.cbWrong.BackColor = System.Drawing.Color.Red;

        this.cbCorrect.Checked = false;
        this.cbCorrect.BackColor = System.Drawing.Color.Transparent;

    }
    else
    {
        cbWrong.BackColor = System.Drawing.Color.Transparent;
    }

}