# Prevalue Source Types Overview

There are some default prevalue source types that can be used.

Here is a quick overview of them:

* **Get values from textfile**
  * Upload a textfile that contains the prevalues. Each prevalue should have its own line in the file. Once the file has been uploaded, you can find it in `~/wwwroot/App_Data/UmbracoForms/Data/PreValueTextFiles/{GUID}` where the `{GUID}`is replaced with the pre-value ID.
* **Umbraco Documents**
  * Allows to use content nodes from a specific source as prevalues. You can define the root node by either
  * Choosing a node directly from the Content tree or
  * Using XPath

Additional settings can be applied:

* Select which **Value field** should be used for the value of the prevalue.
* Select **Use current page as root** instead of choosing a specific root node. *The preview is not available when this setting is enabled.*
* Select a specific **Document type**, if the selected root node contains a different Document Type.
* Select **List all Descendants** of the selected root node to list all levels of descendants.
* Select **Order by** from the drop-down list to display how the prevalue list should be ordered.
* **SQL Database**
  * Connect to a OleDB compatible database table and construct a prevalue source from it. Once selected, it will be editable from the Forms interface.
  * The following configurations need to be set:
  * Connection string (either choose one from your web.config or add another from a textfield.
  * Connection String from configuration
  * Table Name
  * Key Column
  * Value Column
  * Caption Column
* **Umbraco Data Type Prevalues**
  * Choose an Umbraco Data Type to use its configured prevalue collection.

In the example below, the prevalue collection from a Data Type called `Home - Font - Radio button` is used:

![Data Type prevalues](/files/tc9iaQEgzomdRfCNH2rl)


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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.