50) How to create the EventHandler in D365

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/// <summary>

/// The <c>AVAEntAssetWorkOrderTableFrm_EventHandler</c> contains the TransMountain extending logic for the <c>EntAssetWorkOrderTable</c> form.
/// </summary>

class AVAEntAssetWorkOrderTableFrm_EventHandler
{
    /// <summary>
    /// Enable and disable the fields and  button on the condition workorder type is pipeline
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    [FormDataSourceEventHandler(formDataSourceStr(EntAssetWorkOrderTable, WorkOrderTable), FormDataSourceEventType::Activated)]
    public static void WorkOrderTable_OnActivated(FormDataSource sender, FormDataSourceEventArgs e)
    {
        FormRun                   formRun                   = sender.formRun();
        FormDataSource            entAssetWorkOrderTable_ds = formRun.dataSource(formDataSourceStr(EntAssetWorkOrderTable, WorkOrderTable)) as FormDataSource;
        EntAssetWorkOrderTable    entAssetWorkOrderTable    = entAssetWorkOrderTable_ds.cursor();
        FormControl               dpmsUrlButton             = formRun.design().controlName(formControlStr(EntAssetWorkOrderTable, AVADpmsUrlLink)); // Form button control name
        boolean                   enableDPMSButton          = (entAssetWorkOrderTable.workOrderType().AVAWorkOrderTypeClassification == AVAWorkOrderTypeClassification::Pipeline);

        entAssetWorkOrderTable_ds.object(fieldnum(entAssetWorkOrderTable, AVAYearofIssue)).enabled(enableDPMSButton);
        entAssetWorkOrderTable_ds.object(fieldnum(entAssetWorkOrderTable, AVAKMPost)).enabled(enableDPMSButton);
        entAssetWorkOrderTable_ds.object(fieldnum(entAssetWorkOrderTable, AVAEnableDPMS)).enabled(enableDPMSButton);
        
        // Form control button
        dpmsUrlButton.enabled(enableDPMSButton);
    }

}


Note: - here you can write the multiple extension if the you are written for the same Form

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