# Saving

## Single

Each piece of data in a save state has an ID (`string`). This makes it possible to retrieve specific data by ID.

Saving data can be done with a single line with  the `AddData` method. 

```csharp
saveState.AddData("MyDataID", data);
```

The first parameter is the ID of the data, and the second parameter is the data itself. Any serializable data type can be saved. However,  most Unity types are not savable. ESave can save common Unity data types, including (but not limited to) `Vector2`, `Vector3`, `Vector4`, `Quaternion`, `Color`, `Transform`, and `RectTransform`.

This method returns a [Save Operation](/esave/esave-pro/scripting/save-operation.md) (result type: `bool`).  The result is true if the data was successfully
 added. Otherwise, false.

## Multiple

You can use the `AddData` method to save multiple data with one call. This can be done by providing the data as a value tuple with a string as the first item and the data as the second.

```csharp
saveState.AddData(("MyDataID1", myData1), ("MyDataID2", myData2));
```

This method returns a [Save Operation](/esave/esave-pro/scripting/save-operation.md) (result type: `bool`).  The result is true if all provided data was
 added successfully. If even one fails to be added, the result is false.


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