# Class CommandParameterAlreadyExistsException

OptimaJet.Workflow.Core.Fault.CommandParameterAlreadyExistsException

Represents an exception thrown when a command parameter with the same name already exists.

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

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

## Type Hierarchy

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

## Constructors

`public CommandParameterAlreadyExistsException(string commandName, string parameterName, string schemeCode)` 

Initializes a new instance of the [CommandParameterAlreadyExistsException](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/CommandParameterAlreadyExistsException/) class for the specified command and parameter names in the given scheme.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `commandName` | `String` | The command where the parameter already exists. |
| `parameterName` | `String` | The duplicate parameter name. |
| `schemeCode` | `String` | The workflow scheme code containing the duplicated parameter. |

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