possible mistaken empty statement

Question

I am new to programming and I have come across an issue called a "Possible mistaken empty statement" now I have done a lot of research on this topic, and the solution I was given was to remove the semi colon after the if statement, however this only produces more warnings and more errors that I currently do not know the solution to, I would very much appreciate the help, the language I am using is C#.

if (checkBox5.Checked = true) ;
Double value5 = Convert.ToDouble(checkBox4.Checked);
value5 = +1;
Double result5 = value5;
label2.Text = Convert.ToString(result5);

Answer 1

I guess that this is what you want:

if (checkBox5.Checked == true)
{
    double value5 = Convert.ToDouble(checkBox4.Checked) + 1;
    label2.Text = value5.ToString();
}

= is assigment, whereas == is checking for equality, on the other hand semicolon after if will terminate whole if statement.

Note that when you are checking for true then you can use this:

if (checkBox5.Checked) {  }

Answer 2

You should use;

if (checkBox5.Checked == true)

not

if (checkBox5.Checked = true)

= is assignment operator, == is equality operator.

Check out;

• http://msdn.microsoft.com/en-us/library/sbkb459w(v=vs.110).aspx
• http://msdn.microsoft.com/en-us/library/53k8ybth(v=vs.110).aspx

And or course when you check your true value, you can use your if condition like;

if (checkBox5.Checked)
{
  // Do something if checkBox5 is checked.
}

And if you use semicolon after your if condition;

if (checkBox5.Checked = true) ;

is equivalent to

if (checkBox5.Checked = true) { }

So in your case I think you shouldn't use semicolon either. Because if you use it, your code will be look like;

if (checkBox5.Checked = true)
{

}

Double value5 = Convert.ToDouble(checkBox4.Checked);
value5 = +1;
Double result5 = value5;
label2.Text = Convert.ToString(result5);

which I assume you don't want to do this. And remember, even if there is no body to execute, doesn't mean that the loop terminates.

Answer 3

The problem is the semi-colon at the end of your if as well as the single '=', should be:

if (checkBox5.Checked = true) ;

Should be:

if (checkBox5.Checked == true) // double '==' for equality comparison