| Contains(StringBuilder, Char) | Indicates whether a specified Unicode character is found in a StringBuilder. |
| Contains(StringBuilder, Char, Int32) | Indicates whether a specified Unicode character is found in a StringBuilder. The search starts at the specified index. |
| Contains(StringBuilder, Char, Int32, Int32) | Indicates whether a specified Unicode character is found in a StringBuilder. The search begins at a specified index and a specified number of character positions are checked. |