# FileLength (String filePath)

| **Name**    | ***FileLength***                                    |
| ----------- | --------------------------------------------------- |
| Syntax      | FileLength (String filePath)                        |
| Purpose     | To return length of the specified file.             |
| Description | Returns the number of bytes in a specified file.    |
| Return Type | Int64                                               |
| Parameter   | filePath \[System.String] – Path of the source file |

![](https://content.gitbook.com/content/zEifS4h8yurLAAwiGNX2/blobs/GfYOosXcG50u9odGb2EO/0.png)

**Example**

In this example, we are passing the required parameters to the function transformation object using a *Variables* object.

Where,

*filePath* = *C:\Users\Kanwal.Azim\OneDrive - Astera Software\Desktop\Functions Documentation\Files\FileLength\Test.txt*

![](https://content.gitbook.com/content/zEifS4h8yurLAAwiGNX2/blobs/LYSQtJyK3DxDKcsxB3nz/1.png)

Right-click on the function transformation object and select *Preview Output.* You can see that Astera Data Stack has returned the number of bytes in the specified file, as evident below:

![](https://content.gitbook.com/content/zEifS4h8yurLAAwiGNX2/blobs/jY5PU2bOmlOcRDHCUpky/2.png)

![](https://content.gitbook.com/content/zEifS4h8yurLAAwiGNX2/blobs/5D5YycFJQaBUtSRb1Yr7/3.png)