Gmail Checker

Overview

Gmail Checker is a Windows Forms application written in C# that allows users to check if email domains are associated with Gmail. The application reads a list of domains provided by the user, checks each domain, and categorizes them into Gmail or non-Gmail domains.

Features

• User-friendly interface to input domains.
• Asynchronous checking of domains to determine if they are Gmail.
• Results are saved to gmail.txt and not_gmail.txt files.
• Error handling to manage exceptions gracefully.

Prerequisites

• .NET Framework
• Visual Studio or any compatible C# development environment

How to Use

1. Clone the repository (if applicable) or download the source code.

2. Open the project in Visual Studio.

3. Build and run the application:

   • Press F5 or click on the Start button to run the application.

4. Input the domains:

   • Enter the domains you want to check, one per line, in the provided text area.

5. Click the "Check" button:

   • The application will disable the check button to prevent multiple clicks and begin checking the domains asynchronously.

6. Wait for the process to complete:

   • Once the checking process is complete, a message box will inform you that the check is completed.

7. Check the results:

   • The results will be saved in two separate text files:
     • gmail.txt: Contains domains associated with Gmail.
     • not_gmail.txt: Contains domains not associated with Gmail.

Exception Handling

• If an error occurs during the domain checking process, an error message will be displayed to the user.

Dependencies

• DnsClient.NET: A .NET library to perform DNS lookups.

Future Improvements

• Add input validation for domain format.
• Implement a progress bar to show the checking progress.
• Enhance the user interface for better user experience.
• Include more comprehensive logging and error handling.