# Use DataTable with Table and Edit Grid controls

> Make sure you already have a DataTable object in your app.

Make sure you already have a DataTable object in your app.

DataTables objects can be defined as input, output, or input/output arguments of a process. To use these DataTable objects, you need to reference the process where they are used as arguments.

:::note
DataTable only supports primitives in a column. Complex type arguments in a column do not function in DataTable.
:::

Say you have a process named "Process_A", which has the DataTable objects as arguments:

|  |  |
| --- | --- |
| Input arguments | in_dt1 |
| Output arguments | out_dt1 |
| Input/Output arguments | inout_dt |

## Table

1. Navigate to the **General** tab of your **Table** control.
2. In the **Data source** field of the control, open the expression editor, and write the following expression:
   ```
   Processes.<process_name>.<datatable_output_argument>.ToListSource
   ```

   For example:

   ```
   Processes.Process_A.out_dt1.ToListSource
   ```

The table columns should reflect the columns of the DataTable object.

## Edit Grid

1. Navigate to the **General** tab of your **Edit Grid** control.
2. In the **Data source** field of the control, open the expression editor, and write the following expression:
   ```
   Processes.<process_name>.<datatable_output_argument>.ToListSource
   ```

   For example:

   ```
   Processes.Process_A.out_dt1.ToListSource
   ```
3. To perform operations on the DataTable rows, such as adding, editing, or deleting:
  1. Make sure the **Editable**, **Add rows**, and **Delete rows** properties are set to **true**.

         ![docs image](https://dev-assets.cms.uipath.com/assets/images/apps/apps-docs-image-371833-f2f948a5.webp)

   2. Switch to the **Events** tab of the **Edit Grid** control, then configure the corresponding rules:
      1. To add rows, click **Create rule** for **Row added**, then use the **Set Value** rule:

         
           
         
         Item To Set
         
         <code>
         Processes.&lt;process_name&gt;.&lt;datatable_output_parameter&gt;
         </code>
         
         For example: 
         <code>
         Processes.Process_A.out_dt1
         </code>
         
         
         
         Value
         <code>
         Processes.&lt;process_name&gt;.&lt;datatable_output_parameter&gt;.AddRow(MainPage.EditGrid.NewItem)
         </code>
         
         For example: 
         <code>
         Processes.Process_A.out_dt1.AddRow(MainPage.EditGrid.NewItem)
         </code>
         
         
           
         

      2. To delete rows, click **Create rule** for **Row deleted**, then use the **Set Value** rule:

         
           
         
         Item To Set
         
         <code>
         Processes.&lt;process_name&gt;.&lt;datatable_output_parameter&gt;
         </code>
         
         For example: 
         <code>
         Processes.Process_A.out_dt1
         </code>
         
         
         
         Value
         
         <code>
         Processes.&lt;process_name&gt;.&lt;datatable_output_parameter&gt;.DeleteRowAt(MainPage.EditGrid.RowIndex)
         </code>
         
         For example: 
         <code>
         Processes.Process_A.out_dt1.DeleteRowAt(MainPage.EditGrid.RowIndex)
         </code>
         
         
           
         

      3. To modify rows, click **Create rule** for **Row modified**, then use the **Set Value** rule:

         
           
         
         Item To Set
         
         <code>
         Processes.&lt;process_name&gt;.&lt;datatable_output_parameter&gt;
         </code>
         
         For example: 
         <code>
         Processes.Process_A.out_dt1
         </code>
         
         
         
         Value
         
         <code>
         Processes.&lt;process_name&gt;.&lt;datatable_output_parameter&gt;.UpdateRowAt(MainPage.EditGrid.RowIndex, MainPage.EditGrid.SelectedItem)
         </code>
         
         For example: 
         <code>
         Processes.Process_A.out_dt1.UpdateRowAt(MainPage.EditGrid.RowIndex, MainPage.EditGrid.SelectedItem)
         </code>