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How to validate Gantt field while adding in .NET WebForms application?

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In ASP.NET Web Forms Gantt control, it is possible to validate the fields provided by the user while adding or editing the data using action Begin client side event. This event will be triggered with requestType argument as save before saving the data to Gantt, so at this point we can validate the fields with required condition.

The following code example explains the above scenario,

<ej:Gantt ID="Gantt" runat="server" 
Load="load" ActionBegin="actionBegin">
    function load (args) {
        var columns = this.getColumns();
        var column1 = {
            field: "ActualDate",
            headerText: "Actual Date",
            mappingName: "ActualDate",
            editType: "datepicker",
        column2 = {
            field: "EstimateDate",
            headerText: "Estimate Date",
            mappingName: "EstimateDate",
            editType: "datepicker",
        columns.splice(4, 0, column1, column2)
    function actionBegin(args) {
        if (args.requestType == "save") {
            if (Date.parse(>Date.parse( {
                args.cancel = true;
                window.alert("Actual Date should not be greater than Estimated Date");

The above example shows on how to validate the custom columns and alert the user if condition fails and cancel the add operation.

Sample link:

The simple sample to validate the Gantt fields while adding/ editing the data is available in the following link. Sample 


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