A step-by-step guide to building an AI-powered Excel translator in C# using OpenAI GPT models and Syncfusion's XlsIO library. The solution reads Excel cell content, skips formulas and numeric values, sends text to OpenAI for translation, and writes results back while preserving formatting and layout. Includes full code examples for setting up the OpenAI client, iterating worksheets, caching translations to reduce API calls, and exporting the translated workbook. Use cases span HR, finance, sales, and supply chain teams working across multiple languages.
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