i want create online editor but not working [closed]

   // C# snippets
                    { caption: "Console.WriteLine", value: "Console.WriteLine(${1:"message"});", meta: "C#" },
                    { caption: "if", value: "if (${1:condition}) {nt${2:// body}n}", meta: "C#" },
                    { caption: "for", value: "for (int ${1:i} = 0; ${1:i} < ${2:n}; ${1:i}++) {nt${3:// body}n}", meta: "C#" },

this code given me a chatgpt but it’s doesn’t work correctly, i want when user typing any command of c# language then automatically that text take a appropriate color like a visual studio or vs code