# Class ParameterAlreadyExistsException

OptimaJet.Workflow.Core.Fault.ParameterAlreadyExistsException

Represents an exception thrown when a workflow parameter with the same name is already present in a scheme.

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

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

## Type Hierarchy

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

## Constructors

`public ParameterAlreadyExistsException(string parameterName, string schemeCode)` 

Initializes a new instance of the [ParameterAlreadyExistsException](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/ParameterAlreadyExistsException/) class for a duplicate parameter name in the specified workflow scheme.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `parameterName` | `String` | The name of the parameter that already exists in the scheme. |
| `schemeCode` | `String` | The workflow scheme code that already contains this parameter. |

### Remarks

The exception message is initialized using `Parameter with name '{parameterName}' already exists in '{schemeCode}' scheme.`

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