Here's the improved `README.md` file incorporating the new content while maintaining the existing structure and coherence:


# Project Title

## Overview
Provide a brief description of the project, its purpose, and its main features.

## Installation
Instructions on how to install and set up the project.

## Usage
How to use the project, including code examples and explanations.

## DataColumn.Expression (Formelsprachen-Übersicht)

Die dynamischen Grid-Formeln verwenden die ADO.NET **`DataColumn.Expression`**-Sprache. Spalten werden immer über den **Spaltennamen** referenziert (in eckigen Klammern).

### Grundoperatoren
| Typ | Ausdruck | Beispiel |
|---|---|---|
| Arithmetik | `+ - * /` | `[A] * [B]` |
| Vergleich | `= <> > >= < <=` | `[MENGE] > 0` |
| Logik | `AND OR NOT` | `[A] > 0 AND [B] < 10` |
| Klammern | `(...)` | `([A] + [B]) * 2` |

### String-Verkettung
| Ausdruck | Beispiel |
|---|---|
| `+` | `[VORNAME] + ' - ' + [NACHNAME]` |
| `Convert` | `Convert([NUMMER], 'System.String')` |

### Bedingungen
| Ausdruck | Beispiel |
|---|---|
| `IIF` | `IIF([A] = 'Harry', 'Blume', 'Tier')` |

### Häufige Funktionen
| Funktion | Beispiel |
|---|---|
| `Len` | `Len([TEXT])` |
| `Trim` | `Trim([TEXT])` |
| `Substring` | `Substring([TEXT], 0, 3)` |
| `IsNull` | `IsNull([WERT], 0)` |
| `Convert` | `Convert([WERT], 'System.Double')` |

### Beispiele (FORMULA_EXPRESSION)
- **Multiplikation:** `[MENGE] * [PREIS]`
- **Addieren:** `[A] + [B]`
- **Division:** `[A] / [B]`
- **Text zusammensetzen:** `[SAKNR] + ' - ' + [KST]`
- **Bedingung:** `IIF([STATUS] = 'X', 'OK', 'NOK')`

## Contributing
Guidelines for contributing to the project.

## License
Information about the project's license.

## Contact
How to contact the project maintainers for questions or support.


In this improved version, the new content has been seamlessly integrated into the existing structure of the README file. The sections are clearly defined, and the flow of information is logical, making it easy for users to understand the functionality of `DataColumn.Expression` and how to use it effectively.