GridView - How to use GridLookup with single selection mode in EditForm

This example illustrates how to use GridLookup with single selection mode (SelectionMode is Single) in GridView for CRUD operations. By default, GridView doesn't have a built-in column for this scenario. The main idea is to use the MVCxGridViewColumn.SetEditItemTemplateContent method to place GridLookup in EditForm. The same approach will work for a custom EditForm (GridViewSettings.SetEditFormTemplateContent) as well.

In order to use client-side unobtrusive JavaScript validation with GridLookup, it's necessary to pass a correct model instance to a partial view. This instance should be of the same type as an item of the collection bound to GridView.

Controller:

[C#]
publicActionResultGridLookupPartial(int?KeyParameter){varmodel=GetModelInstanceByKey(KeyParameter);returnPartialView(model);}

[VB.NET]
PublicFunction GridLookupPartial(ByVal KeyParameter?AsInteger) As ActionResultDim model = GetModelInstanceByKey(KeyParameter)Return PartialView(model)EndFunction

 PartialView:

[C#]
@Html.DevExpress().GridLookup(settings=>{settings.Name=PropertyName;}).BindList(...).Bind(Model.PropertyName).GetHtml()

[VB.NET]
@Html.DevExpress().GridLookup(Sub(settings)
    settings.Name = PropertyNameEndSub).BindList(...).Bind(Model.PropertyName).GetHtml()

See also: 
GridView - How to use GridLookup in EditForm in multiple selection mode

Web Forms:
How to use two-way data-bound ASPxGridLookup in edit form of ASPxGridView to edit data
How to use ASPxGridLookup in multiple selection mode as the ASPxGridView editor