One last error

my first app almost worked i have one error

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6 Replies - 751 Views - Last Post: 20 December 2010 - 06:27 PM Rate Topic: -----

#1 Sadin56  Icon User is offline

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One last error

Posted 20 December 2010 - 05:11 PM

Hi i recently made a post about my application problems Here i fixed all the errors listed there but now i have a new error and i dont know what it means.

  • Error 1 Method must have a return type C:\Users\Sadin\Documents\Visual Studio 2010\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs 15 16 WindowsFormsApplication1


Here is my current code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1

{
    public partial class FirstApp : Form
    {
        public Application()
        {
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void smdsubmit_Click(object sender, EventArgs e)
        {
            if (!(string.IsNullOrEmpty(txtText.Text)) && txtText.Text != "")
            {
                lblResults.Text = txtText.Text;
            }
            else
            {
                MessageBox.Show("Please provide a text value!");
            }
        }
    }
}



Id appreciate any help

~Thanks!

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#2 JackOfAllTrades  Icon User is offline

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Re: One last error

Posted 20 December 2010 - 05:18 PM

public partial class FirstApp : Form
    {
        public Application()
        {
            InitializeComponent();
        }


Your class name is FirstApp. The constructor for your class must have the same name as your class.
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#3 Sadin56  Icon User is offline

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Re: One last error

Posted 20 December 2010 - 05:26 PM

So what must i do exactly?

:helpsmilie: im sorry but i really dont know what the constructor is or what your telling me to change.

This post has been edited by Sadin56: 20 December 2010 - 05:27 PM

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#4 tlhIn`toq  Icon User is offline

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Re: One last error

Posted 20 December 2010 - 05:44 PM

    public partial class FirstApp : Form
    {
        public Application()
        {
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }
}




Notice that textBox1_TextChanged method has a return type of 'void'. This means there is nothing returned from this method.
Notice that Application() method has no return type at all. So the compiler thinks this is supposed to be the constructor for the class. But the constructor of a class must be of identical name to the class itself.

Your class is named FirstApp therefore your constructor method must be named FirstApp
change public Application() to public FirstApp()

I agree we are happy to help. Sometimes the best help is examples. Sometimes its solving the problem. Sometimes its pointing toward some good resources.

I am going to guess that you are trying to teach yourself C# without much guidance, a decent book or without knowing where to look. Sometimes just knowing where to look can make all the difference. Google is your friend.
Search with either "C#" or "MSDN" as the first word: "MSDN Picturebox", "C# Custom Events", "MSDN timer" etc.

But honestly, just typing away and seeing what pops up in Intellisense is going to make your self-education take 20 years. You can learn by trying to reverse engineer the language through banging on the keyboard - or you can learn by doing the tutorials and following a good "How to learn C#" book.

May I suggest picking up a basic C# introductory book? It's not that people here don't want to be helpful, but there is a certain amount of basic learning work that one should really take upon themselves before asking for help. There are so many great "How do I build my first application" tutorials on the web... There are dozens of "Learn C# in 21 days", "My first C# program" books at your local book seller or even public library... Asking a forum, any forum, to hand-hold you through it is just redundant. In many ways it disrespects the people who have invested dozens of hours in the on-line tutorials and those that spent thousands of hours in authoring books.

Build a Program Now! in Visual C# by Microsoft Press, ISBN 0-7356-2542-5
is a terrific book that has you build a Windows Forms application, a WPF app, a database application, your own web browser.

C# Cookbooks
Are a great place to get good code, broken down by need, written by coding professionals. You can use the code as-is, but take the time to actually study it. These professionals write in a certain style for a reason developed by years of experience and heartache.

Microsoft Visual Studio Tips, 251 ways to improve your productivity, Microsoft press, ISBN 0-7356-2640-5
Has many, many great, real-world tips that I use all the time.

The tutorials below walk through making an application including inheritance, custom events and custom controls.
Quick and easy custom events
Bulding an application - Part 1
Building an application - Part 2
Debugging tutorial
Working with environmental variables

Writing a text file is always one of the first things people want to do, in order to store data like high-scores, preferences and so on
Writing a text file tutorial.

These are just good every-day references to put in your bookmarks.
MSDN C# Developers Center with tutorials
Welcome to Visual Studio

Have you seen the MSDN Code Samples? They spent a lot of time creating samples and demos. It seems a shame to not use them.

  • Anonymous Delegates: Demonstrates the use of unnamed delegates to reduce application complexity.
  • Arrays: Shows how to use arrays.
  • Attributes: Shows how to create custom attribute classes, use them in code, and query them through reflection.
  • Collection Classes: Shows how to make non-generic collection classes that can be used with the foreach statement.
  • COM Interop Part I: Shows how to use C# to interoperate with COM objects.
  • COM Interop Part II: Shows how to a use a C# server together with a C++ COM client.
  • Commandline: Demonstrates simple command-line processing and array indexing.
  • Condiational Methods: Demonstrates conditional methods, which provide a powerful mechanism by which calls to methods can be included or omitted depending on whether a symbol is defined.
  • Delegates: Shows how delegates are declared, mapped to static and instance methods, and combined into multicast delegates.
  • Events: Shows how to declare, invoke, and configure events in C#.
  • Explicit Interface: Demonstrates how to explicitly implement interface members and how to access those members from interface instances.
  • Generics: Shows how to make generic collection classes that can be used with the foreach statement.
  • Hello World: A Hello World application.
  • Indexers Part I: Shows how C# classes can declare indexers to provide array-like access to objects.
  • Indexers Part II: Shows how to implement a class that uses indexed properties. Indexed properties enable you to use a class that represents an array-like collection.
  • Libraries: Shows how to use compiler options to create a DLL from multiple source files; also, how to use the library in other programs
  • Named and Optional (C# 4.0): Demonstrates Named and Optional parameters, an alternative to method overloads
  • Nullable: Demonstrates value types, such as double and bool, that can be set to null
  • Office Sample (C# 4.0): Demonstrates how Dynamic and COM Interop make it easy to call Microsoft Office in C# 4.0
  • OLEDB: Demonstrates how to use a Microsoft Access database from C# by creating a dataset and adding tables to it.
  • Operator Overloading: Shows how user-defined classes can overload operators
  • Partial Types: Demonstrates how classes and structures can be defined in multiple C# source-code files
  • PInvoke: Shows how to call exported DLL functions from C#
  • Properties: Shows how properties are declared and used; also demonstrates abstract properties
  • Python Sample (C# 4.0): Learn how to call a Python script by using the Dynamic feature in C# 4.0
  • Security: Discusses .NET Framework security and shows how to modify security permissions in C# by using permission classes and permission attributes
  • Simple Variance (C# 4.0): See how Covariance and Contravariance are supported in generic interfaces and delegates
  • Structs: Shows how to use structs in C#.
  • Threading: Demonstrates various thread activities such as creating and executing a thread, synchronizing threads, interacting between threads, and using a thread pool
  • Unsafe: Shows how to use unmanaged code (code that uses pointers) in C#
  • User Conversions: Shows how to define conversions to and from user-defined types
  • Versioning: Demonstrates versioning in C# by using the override and new keywords
  • XML Documents: Shows how to document code by using XML
  • Yield: Demonstrates how to use the yield keyword to filter items in a collection

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#5 Sadin56  Icon User is offline

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Re: One last error

Posted 20 December 2010 - 06:08 PM

tlhIn'toq, thanks so much.

I am VERY new to this and yes i will look into getting a manual/recourse book for C# cause i am very interested in it.

Thank you again for taking the time to post this it obviously took alot of time and effort on your part and i appreciate it very much.

I realized i was kind of pushing it asking for help when i had little to none knowledge of this language and i intend to work at it from other sources and only post help to my problems no posts for requesting instruction.

And i am very sorry for anyone i may have disrespected.

This post has been edited by Sadin56: 20 December 2010 - 06:10 PM

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#6 Sergio Tapia  Icon User is offline

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Re: One last error

Posted 20 December 2010 - 06:15 PM

Don't sweat it, it may be apparent to us, but a problem like this will take a new programmer some time to solve. Pick up a book and get crackin'! Rome wasn't built in a day.
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#7 Sadin56  Icon User is offline

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Re: One last error

Posted 20 December 2010 - 06:27 PM

:D yes thanks i will!
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