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Validation

 FromSubjectDate CreatedHas Attachment#
CollapseDeveloper Express - Ray 12/3/2019 
 
The value cannot be empty.
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 Please, correct all errors.
  Andrew FullerRe: New Holiday Skin12/3/2019Edit
 Collapse Re: New Holiday Skin12/3/2019Edit
   Nancy DavolioRe: New Holiday Skin12/3/2019Edit
 CollapseJanet LeverlingRe: New Holiday Skin12/8/1985Edit
  ExpandMax V. Evseev (Developer Express) 12/4/2019Edit
 CollapseAnne Dodsworth 12/6/2019Edit
   Margaret PeacockRe: New Holiday Skin12/7/2019Edit

The DevExpress ASP.NET Tree List (ASPxTreeList) allows you to manually validate edited nodes and display errors for invalid fields.

This demo illustrates how to include data validation in your next ASP.NET project. Validation is implemented within the NodeValidating event handler. Invalid values are indicated via error icons. Hovering the mouse over an icon displays a hint along with an error description.

The HtmlRowPrepared event is handled to indicate nodes with invalid data. This event is raised for each node when the corresponding row within the table has been created. In this example, nodes with invalid data are painted in red.