{"id":6055,"date":"2025-01-24T17:43:56","date_gmt":"2025-01-24T17:43:56","guid":{"rendered":"http:\/\/localhost:8080\/csharp-test\/docs\/c\/cezd_hash-statements\/throw\/"},"modified":"2025-03-26T03:48:05","modified_gmt":"2025-03-26T03:48:05","slug":"throw","status":"publish","type":"docs","link":"https:\/\/www.completecsharptutorial.com\/docs\/csharp\/csharp-basic-statements\/throw\/","title":{"rendered":"Throw"},"content":{"rendered":"\t\t
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C# Throw Example: Handle Errors Like a Pro!<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Ever had your program crash out of nowhere? Annoying, right? \ud83d\ude2b What if I told you that you could take control of errors instead of letting them ruin your day? That\u2019s where throw statements<\/strong> come in!<\/p>

In this lesson, we\u2019ll break down the C# throw statement<\/strong> with a real-world example<\/strong>, complete code<\/strong>, and step-by-step explanation<\/strong>. So, let\u2019s make errors work for us instead of against us! \ud83d\ude03<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\r\n <\/i>\r\n
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What You Are Going to Learn in This Lesson<\/h5>\r\n

\u2714\ufe0f What is a throw statement<\/strong> in C#?
\u2714\ufe0f How does it work with exceptions?
\u2714\ufe0f A real-world example<\/strong> with complete code<\/strong> & output<\/strong>
\u2714\ufe0f Why and when to use it?
\u2714\ufe0f A friendly summary + what\u2019s next \ud83d\ude80<\/p>

Sounds exciting? Let\u2019s go! \ud83c\udfaf<\/p> <\/div>\r\n <\/div>\r\n \r\n \r\n \r\n \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Introduction: What is a Throw Statement in C#?<\/strong><\/h3>

In simple words, a throw statement<\/strong> is used to intentionally create an error (exception)<\/strong> in your program. Instead of letting C# crash randomly, you tell it when and how to fail<\/strong>.<\/p>

For example:<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\r\n\t\t\t\t\r\n\t\t\t\t\tthrow new Exception("Oops! Something went wrong!");\r\n\t\t\t\t<\/code>\r\n\t\t\t<\/pre>\r\n            <\/div>\r\n                \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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This line stops the program<\/strong> and displays the error message. But why would you want that? Well, sometimes, you need to validate input<\/strong> or prevent serious mistakes<\/strong>.<\/p>
Let\u2019s see how it works in real life!<\/p>
Real-World Scenario: ATM Withdrawal System \ud83c\udfe7<\/strong><\/h4>
Imagine you’re using an ATM. You enter an amount, but what if it’s more than your balance<\/strong>? Instead of giving you money you don\u2019t have (which would be awesome but illegal! \ud83d\ude02), the system throws an error<\/strong> and stops the transaction.<\/p>
Let\u2019s write a C# Throw Example<\/strong> for this! \ud83d\ude80<\/p>
C# Throw Example: ATM Withdrawal<\/strong><\/h4>
\ud83d\udcbb Code Example:<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\r\n\t\t\t\t\r\n\t\t\t\t\tusing System;\r\n\r\nclass Program\r\n{\r\n    static void WithdrawMoney(double balance, double amount)\r\n    {\r\n        if (amount > balance)\r\n        {\r\n            throw new Exception("Insufficient balance! You can\u2019t withdraw more than what you have.");\r\n        }\r\n\r\n        balance -= amount;\r\n        Console.WriteLine($"Withdrawal successful! Your new balance is: ${balance}");\r\n    }\r\n\r\n    static void Main()\r\n    {\r\n        try\r\n        {\r\n            double myBalance = 500.00;\r\n            Console.WriteLine($"Current Balance: ${myBalance}");\r\n            \r\n            Console.Write("Enter amount to withdraw: ");\r\n            double withdrawAmount = Convert.ToDouble(Console.ReadLine());\r\n\r\n            WithdrawMoney(myBalance, withdrawAmount);\r\n        }\r\n        catch (Exception ex)\r\n        {\r\n            Console.WriteLine($"Error: {ex.Message}");\r\n        }\r\n    }\r\n}\r\n\t\t\t\t<\/code>\r\n\t\t\t<\/pre>\r\n            <\/div>\r\n                \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Output 1 (Valid Withdrawal)<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\r\n\t\t\t\t\r\n\t\t\t\t\tCurrent Balance: $500\r\nEnter amount to withdraw: 200\r\nWithdrawal successful! Your new balance is: $300\r\n\t\t\t\t<\/code>\r\n\t\t\t<\/pre>\r\n            <\/div>\r\n                \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Output 2 (Invalid Withdrawal – More Than Balance)<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\r\n\t\t\t\t\r\n\t\t\t\t\tCurrent Balance: $500\r\nEnter amount to withdraw: 600\r\nError: Insufficient balance! You can\u2019t withdraw more than what you have.\r\n\t\t\t\t<\/code>\r\n\t\t\t<\/pre>\r\n            <\/div>\r\n                \t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Breaking Down the Code \ud83e\uddd0<\/strong><\/h4>
Let\u2019s go step by step so that you fully understand this.<\/p>
1\ufe0f\u20e3 WithdrawMoney() Method<\/strong><\/p>
  • It checks if the withdrawal amount is greater than the balance<\/strong>.<\/li>
  • If yes, it throws an error<\/strong> (throw new Exception(...)<\/code>).<\/li>
  • Otherwise, it deducts the amount<\/strong> and prints the new balance.<\/li><\/ul>
    2\ufe0f\u20e3 Main() Method<\/strong><\/p>
    • Asks the user to enter an amount.<\/li>
    • Calls WithdrawMoney()<\/code> with the given amount.<\/li>
    • If an error happens, the catch block<\/strong> catches it and displays a friendly message instead of crashing.<\/li><\/ul>
      Why Use Throw Statements? \ud83e\udd14<\/strong><\/h3>
      • Prevents bad input<\/strong> (e.g., withdrawing more than your balance).<\/li>
      • Gives meaningful error messages<\/strong> instead of random crashes.<\/li>
      • Stops the program from doing something it shouldn’t<\/strong> (like giving out free money! \ud83d\udcb8\ud83d\ude02).<\/li>
      • Makes debugging easier<\/strong> because errors are controlled.<\/li><\/ul>
        Conclusion:<\/strong><\/h3>
        See? C# throw statements<\/strong> aren\u2019t scary at all! They help you handle problems smoothly<\/strong> instead of letting your program go crazy. You\u2019ve just learned:<\/p>
        \u2714\ufe0f What a throw statement<\/strong> is.
        \u2714\ufe0f How it prevents bad actions<\/strong> (like overdrawing money).
        \u2714\ufe0f How to write and use throw in C#<\/strong>.
        \u2714\ufe0f A real-world ATM example<\/strong> with output.<\/p>
        So, next time your program misbehaves, throw<\/strong> some errors like a pro! \ud83d\ude03<\/p>
        Next What? \ud83d\ude80<\/strong><\/h3>
        In the next lesson, you\u2019ll learn about Checked & Unchecked Statements in C#<\/strong>. These are super useful for handling integer overflows<\/strong> and unexpected calculations<\/strong>. It\u2019s gonna be fun\u2014so stay tuned! \ud83d\ude03<\/p>
        \ud83d\udca1 If you have difficulty or a question, drop a comment. We\u2019ll be happy to help you!<\/strong> \ud83d\ude0a<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"
        Learn C# throw example in a simple way! Get a real-world scenario, complete code, explanation, and output. Perfect for beginners! <\/p>\n","protected":false},"author":1,"featured_media":0,"parent":6041,"menu_order":43,"comment_status":"open","ping_status":"closed","template":"","doc_tag":[],"class_list":["post-6055","docs","type-docs","status-publish","hentry","no-post-thumbnail"],"acf":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/docs\/6055","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/comments?post=6055"}],"version-history":[{"count":7,"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/docs\/6055\/revisions"}],"predecessor-version":[{"id":7638,"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/docs\/6055\/revisions\/7638"}],"up":[{"embeddable":true,"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/docs\/6041"}],"wp:attachment":[{"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/media?parent=6055"}],"wp:term":[{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/www.completecsharptutorial.com\/wp-json\/wp\/v2\/doc_tag?post=6055"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}