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Example 3 shows how to validate the Order No property of the Order object to be longer than 5 characters. However, instead of getting an individual cell, you are getting an entire row. Although Git Hub is a very well-known platform, we saw a better and easier approach for reviewing our examples in our SDK Samples Browser.

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It may be set to one of the following values: In R2 2016, Telerik introduced the Validation Type property of Rad Grid View. This results in a binding validation error (Figure 3) and the Grid View Bound Column Base editor will enter into an invalid state. With the Silverlight platform, you can take advantage of the System. It is even better when you use RIA services, since this code will be automatically added for you by the RIA Service's code generator.

It provides you with the possibility to choose what type of validation to apply for each instance of Rad Grid View. In the previous examples, the data was validated per cell, using the Cell Validating event or property validation. Grid View Row Validating Event Args) Dim order As Order = Try Cast(e. The code snippet below shows you how to use Data Annotations in order to validate the Order NO property of the Order object.

It is a Flags Enumeration and can take the following values: The cell validation occurs when a Grid View Cell is edited and its new data is about to be committed. You can do the same thing per row, using the Row Validating event. Length Private Sub rad Grid View_Row Validating(By Val sender As Object, By Val e As Telerik. [Required] public string Order NO { get { return this.order No; } set { Validation Context validation Context = new Validation Context( this, null, null ); validation Context. Validate Property( value, validation Context ); this.order No = value; } } _ Public Property Order NO() As String Get Return Me.order No End Get Set(By Val value As String) Dim validation Context As New Validation Context(Me, Nothing, Nothing) validation Context. Validate Property(value, validation Context) Me.order No = value End Set End Property Once the UI and Data validation is passed (i.e., the Binding tried to update the value for the bound property), the Cell Validated event is raised. Here you can also add a custom logic like changing the visual state of the editor (through the e. For a general example on how to validate the data, you can check our Validation online demos.At this moment, a Cell Validating event is fired and since the new value is not committed yet to the underlying data object, here is the perfect place for applying a custom UI validation. The Row Validating event is very similar to the Cell Validating event. You can also download runnable projects from our online SDK repository here; the examples are listed under Grid View.One of the most important features provided by Rad Grid View is the data validation.Data validation features enable you to take complete control of the data entered in your grid's cells. This is the validation that is built into the business object implementation. Length Figure 4 shows the result from a failed validation.The purpose of this tutorial is to show you how to validate data using Rad Grid View. An alternative approach is to use validation on a property level as shown in Example 4. Once you have added such errors, you will have to explicitly clear them when needed.The following cases will be discussed: Rad Grid View exposes a property - Validates On Data Errors - that controls the way the data validation, provided by IData Error Info and INotify Data Error Info Interfaces, is performed. Length When you try to enter an order number that has fewer than five characters, you should see a validation message that is similar to Figure 2. Is Valid property to False, this will cancel the editing process and will return focus to the invalid Grid View Cell. In this case, you need to throw an exception when an incorrect value is about to be set. Please check this help article for information about how to clear user defined errors. The following code snippet demonstrates how to use data annotation attributes to validate a property value (again within the property setter).

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