# Class CommandAlreadyExistsException

OptimaJet.Workflow.Core.Fault.CommandAlreadyExistsException

Represents an error that occurs when a command with the same name already exists in a scheme.

Namespace: [OptimaJet.Workflow.Core.Fault](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/)

```csharp
public class CommandAlreadyExistsException : Exception, ISerializable
```

## Type Hierarchy

-   [Exception](https://learn.microsoft.com/dotnet/api/system.exception)
    -   CommandAlreadyExistsException Current type
        -   Implemented interfaces
            -   [ISerializable](https://learn.microsoft.com/dotnet/api/system.runtime.serialization.iserializable)

## Constructors

`public CommandAlreadyExistsException(string commandName, string schemeCode)` 

Initializes a new instance of the [CommandAlreadyExistsException](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/CommandAlreadyExistsException/) class for the specified command name and scheme code.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `commandName` | `String` | The command name that already exists. |
| `schemeCode` | `String` | The scheme code in which the duplicate command was detected. |

[Previous ColumnNotExistsException](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/ColumnNotExistsException/) [Next CommandNotFoundException](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/CommandNotFoundException/)