How To Use Nested Ternary Operator In C#?

Question

Here i have used if , else if condition to show an error message and make some label visible and invisible, but i am trying to use ternary operator to do so but i am quite unfamiliar with ternery operator and unable to use it for all condition i have in my if else code.
So any help with my code will be highly appreciated. Thank you.

Below is my code

        catch (Exception ex)
        {
            if (ex.Message == "Parent Menu Title Required")
            {
                metroLabel4.Visible = true;
                metroLabel5.Visible = false;
                metroLabel6.Visible = false;
                metroLabel4.Text = ex.Message;
            }
            else if (ex.Message == "Menu Title Required")
            {
                metroLabel4.Visible = false;
                metroLabel5.Visible = true;
                metroLabel6.Visible = false;
                metroLabel5.Text = ex.Message;
            }
            else if (ex.Message == "Form Name Required")
            {
                metroLabel4.Visible = false;
                metroLabel5.Visible = false;
                metroLabel6.Visible = true;
                metroLabel6.Text = ex.Message;
            }
            else
            {
                metroLabel4.Visible = true;
                metroLabel5.Visible = true;
                metroLabel6.Visible = true;
                metroLabel4.Text = "Parent Menu Title Required";                  
                metroLabel5.Text = "Menu Title Required";
                metroLabel6.Text = "Form Name Required";
            }
        }

Answer 1

The ternary operator is not a good fit for your problem. It is used to set the value of one variable to one of two values, based on a predicate:

var thingToSet = predicateA ? 
                 ifPredicateAIsTrue : 
                 ifPredicateAIsFalse;

This is the same as:

if (predicateA)
    thingToSet = ifPredicateAIsTrue;
else
    thingToSet = ifPredicateAIsFalse;

To nest ternary expressions, place a new ternary expression in the value to set:

var otherThingToSet = predicateB ? (
                            predicateC ? 
                            ifPredicateCIsTrue : 
                            ifPredicateCIsFalse
                        ) : (
                            predicateD ? 
                            ifPredicateDIsTrue : 
                            ifPredicateDIsFalse
                        );

This is equivalent to:

if (predicateB)
{
    if (predicateC)
        otherThingToSet = ifPredicateCIsTrue;
    else
        otherThingToSet = ifPredicateCIsFalse;
}
else
{
    if (predicateD)
        otherThingToSet = ifPredicateDIsTrue;
    else
        otherThingToSet = ifPredicateDIsFalse;
}

As you can see, this is not really a good fit for your problem, as you're trying to set the value of several variables, based on the exception message.

A better fit for your problem would be a switch statement:

switch (ex.Message)
{
    case "Parent Menu Title Required":
        metroLabel4.Visible = true;
        metroLabel5.Visible = false;
        metroLabel6.Visible = false;
        metroLabel4.Text = ex.Message;
        break;
    case "Menu Title Required":
        metroLabel4.Visible = false;
        metroLabel5.Visible = true;
        metroLabel6.Visible = false;
        metroLabel5.Text = ex.Message;
        break;
    case "Form Name Required":
        metroLabel4.Visible = false;
        metroLabel5.Visible = false;
        metroLabel6.Visible = true;
        metroLabel6.Text = ex.Message;
        break;
    default:
        metroLabel4.Visible = true;
        metroLabel5.Visible = true;
        metroLabel6.Visible = true;
        metroLabel4.Text = "Parent Menu Title Required";
        metroLabel5.Text = "Menu Title Required";
        metroLabel6.Text = "Form Name Required";
        break;
}