If checkbox checked do something else uncheck

Question

I am trying to create an if statement to prompt me asking if i am sure i want to check the checkbox. If the checkbox is already checked to just uncheck the box. Below is what i have an cant seem to get to work. Thanks! if anyone has a simple way of doing this please advise.

if (checkBox15.Checked == false)
{
    MessageBox.Show("Are you sure you want to check this?", "Prompt", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
    { 
        Updatelist(); 
    } 
    else
    {
        checkBox15.Checked = false;
        return;
    }  
}
else  if (checkBox15.Checked == true)
{
    checkBox15.Checked = false;
    return;
} 

Answer 1

You have missed if(

if(MessageBox.Show("Are you sure you want to check this?", 
    "Prompt", 
    MessageBoxButtons.YesNo, 
    MessageBoxIcon.Question) == DialogResult.Yes)
{ 
    Updatelist(); 
}
else
{
    checkBox15.Checked = false;
    return;
}  

Answer 2

This Is Your Answer

if (checkBox15.IsEnabled == false)
{
MessageBox.Show("Are you sure you want to check this?", "Prompt",    MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{ 
    Updatelist(); 
} 
else
{
    checkBox15.IsEnabled = false;
    return;
}  
}`enter code here`
else  if (checkBox15.IsEnabled == true)
{
checkBox15.Checked = false;
return;