Find the First Duplicate Character in a String using C# | Step-by-Step Guide 

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In this tutorial, we will learn how to find the first duplicate character in a string using C#. This video is perfect for beginners looking to enhance their understanding of string manipulation in C#. Follow along as we walk through the code and explain the logic behind each step.
🔹 Video Contents:
0:00 Introduction
0:30 Problem Explanation
1:00 Writing the C# Code
3:30 Testing the Program
4:30 Conclusion
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