Web Reference: Dec 25, 2025 · In this blog, we’ll demystify this error by first explaining how 2D arrays work in C#, then identifying the most common causes of IndexOutOfRangeException during iteration. Finally, we’ll provide actionable solutions and best practices to help you avoid this error entirely. Because you tried to access an element in a collection, using a numeric index that exceeds the collection's boundaries. The first element in a collection is generally located at index 0. The last element is at index n-1, where n is the Size of the collection (the number of elements it contains). This error happens in C# programs that use array types. This exception will typically occur when a statement tries to access an element at an index greater than the maximum allowable index.
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