I want to see Hello {} in the output, but the following gives compiler errors
Console.WriteLine("{0} \{\}", "Hello");
You need to use double brackets.
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string s = String.Format("{0} {{}}", "Hello");
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Frequently asked questions about string formatting
Using double brackets. See How to avoid parentheses (curly braces) in a format string in .NET , eg.
Console.WriteLine("{0} {{}}", "Hello");