If you have the terrible idea of making a prototype using CodeDOM and explicit snippets like I did, this helps controlling indentation. I'm pretty sure there's a smarter way, but it's not like I think before I type when I make prototypes 😅

CodeSnippetBuilder.cs

using System.Text;

namespace deVoid.Utils {
    // Uses an internal StringBuilder instance and automatically keeps tracks of indentation.
    public class CodeSnippetBuilder {
        public int IndentLevel {
            get { return _indentLevel; }
            set {
                if (value < 0) {
                    value = 0;
                }

                if (value > _indentLevel) {
                    int delta = value - _indentLevel;
                    for (int i = 0; i < delta; i++) {
                        _stringBuilder.Append(Tab);
                    }
                }

                _indentLevel = value;
            }
        }

        // IndentLevel * Tabs are added whenever AppendLine is called, or when IndentLevel *increases*. 
        public readonly string Tab = "    ";

        private int _indentLevel;
        private StringBuilder _stringBuilder = new StringBuilder();

        public CodeSnippetBuilder(StringBuilder builder = null, string existingSnippet = "", string tabbing = "    ") {
            if (builder != null) {
                _stringBuilder = builder;
            }

            if (!string.IsNullOrEmpty(existingSnippet)) {
                _stringBuilder.Append(existingSnippet);
            }

            if (!string.IsNullOrEmpty(tabbing)) {
                Tab = tabbing;
            }
        }

        public CodeSnippetBuilder AppendLine() {
            _stringBuilder.AppendLine();
            for (int i = 0; i < IndentLevel; i++) {
                _stringBuilder.Append(Tab);
            }

            return this;
        }

        public CodeSnippetBuilder Append(string snippet) {
            _stringBuilder.Append(snippet);
            return this;
        }

        public override string ToString() {
            return _stringBuilder.ToString();
        }

        public void Clear() {
            _stringBuilder.Clear();
            IndentLevel = 0;
        }
    }
}