Where to after function

[jmumby]

hello, learner here.

I have a function that checks a textbox for a value if it is below 500 or above 1000 it comes up with a message box. To invoke this I have the function at the top of a action for a button...

void Cal2Click(object sender, EventArgs e)
        {
        WPChk();
        if (port.IsOpen) port.WriteLine("2");
        else MessageBox.Show("Serial port is closed!", "RS232 tester", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

WPChk() is my function to check the value in the text box...

void WPChk()
    	{
    	try
    	{
    	int WhitePointValue;
    	WhitePointValue = int.Parse(WPTarget.Text);
    	
    			if (WhitePointValue > 1000 || WhitePointValue < 500)
    				{	
    				MessageBox.Show("The white point value is out of range. Try a value between 500 and 1000");
    				}
    			else WPTarget.Clear();
    			}
		catch
		{
		MessageBox.Show("Invalid value for whitepoint target");	
		WPTarget.Clear();
		}
    	}

I want the program to stop at that point until a button is pushed again but it just continues. What would you put under WPTarget.Clear(); to halt or am I going about this all the wrong way?

Thanks

[DangerDev]

return true or false from WPChk() based on success or failure,
on the base of return value of WPChk() you decide whether you want to proceed further or not. ex:

if(WPChk())
{
//do this
}
else
{
//return;
}

[jmumby]

ok, I changed it to this

void Cal2Click(object sender, EventArgs e)
        {
        	if(WPChk())
        	{
        	if (port.IsOpen) port.WriteLine("2");
        	else MessageBox.Show("Serial port is closed!", "RS232 tester", MessageBoxButtons.OK, MessageBoxIcon.Error);
        	}
        	else
        	{
        	return;	
        	}
        }

But I got an error "Cannot implicitly convert type 'void' to 'bool' (CS0029)"

[jmumby]

Ok, got it. Changed WPChk to bool and had all the results as return false.

Thanks!