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# StringBuilder Extensions

Extension methods for the built-in StringBuilder type.

<table data-header-hidden><thead><tr><th width="265"></th><th></th></tr></thead><tbody><tr><td><a href="/auctus-class-library/reference/common/data-types/stringbuilder-extensions/append-string-boolean.md">Append(String, Boolean)</a></td><td>Appends the specified string to this instance.</td></tr><tr><td><a href="/auctus-class-library/reference/common/data-types/stringbuilder-extensions/appendline-string-boolean.md">AppendLine(String, Boolean)</a></td><td>Appends the specified string followed by the default line terminator to this instance.</td></tr><tr><td><a href="/auctus-class-library/reference/common/data-types/stringbuilder-extensions/lastappended.md">LastAppended()</a></td><td>Retrieves the last remembered appended string for this instance.</td></tr><tr><td><a href="/auctus-class-library/reference/common/data-types/stringbuilder-extensions/lastindexof.md">LastIndexOf()</a></td><td>Returns the zero-based index position of the last occurrence of a specified Unicode character within this instance.</td></tr></tbody></table>