Documentation(940681-hotfix)-Need to Add topic how to prevent of addi…

ej2-asp-core-mvc/code-snippet/grid/edit/prevent-add-duplicate/customvalidation.cs

@@ -0,0 +1,5 @@
+ public IActionResult Index()
+ {
+  ViewBag.DataSource = OrdersDetails.GetAllRecords();            
+  return View();
+ }      

ej2-asp-core-mvc/code-snippet/grid/edit/prevent-add-duplicate/razor

@@ -0,0 +1,36 @@
+@Html.EJS().Grid("CustomValid").DataSource((IEnumerable<object>)ViewBag.DataSource).Columns(col =>
+{
+   col.Field("OrderID").HeaderText("Order ID").IsPrimaryKey(true).Width("120").TextAlign(Syncfusion.EJ2.Grids.TextAlign.Right).Add();
+   col.Field("CustomerID").HeaderText("Customer Name").Width("150").Add();
+   col.Field("Freight").HeaderText("Freight").Width("120").EditType("numericedit").Format("C2").TextAlign(Syncfusion.EJ2.Grids.TextAlign.Right).Add();
+   col.Field("ShipName").HeaderText("Ship Name").Width("150").Add();
+   col.Field("ShipCountry").HeaderText("Ship Country").EditType("dropdownedit").Width("150").Add();
+}).AllowPaging().EditSettings(edit => { edit.AllowAdding(true).AllowEditing(true).AllowDeleting(true); }).Load("load").Created("created").ActionBegin("actionBegin").Toolbar(new List<string>() { "Add", "Edit", "Delete", "Update", "Cancel" }).Render()
+
+<script>
+    var grid;
+    function created() {
+        grid = this;
+    }
+    function orderIdCustomValidation(args) {
+        return (grid.dataSource).every((data) => {
+            return data['OrderID'] + '' !== args['value'] || data['OrderID'] === grid.editModule.editModule.args.rowData['OrderID']
+        });
+    };
+    var orderIDRules = {
+        required: true,
+        min: [orderIdCustomValidation, 'The entered value already exists in the column OrderID. Please enter a unique value.']
+    };
+    function load(args) {
+        this.columns[1].validationRules = { required: true };
+    }
+    function actionBegin(args) {
+        if (args.requestType === 'save') {
+            grid.editModule.formObj.addRules('OrderID', orderIDRules); // Add form validation rules dynamically.
+            if (!grid.editModule.formObj.validate()) { // Check dynamically added validation rules.
+                args.cancel = true; // Prevent adding duplicate data action.
+            }
+            grid.editModule.formObj.removeRules('OrderID'); // Remove form validation rules dynamically.
+        }
+    }
+</script>

ej2-asp-core-mvc/code-snippet/grid/edit/prevent-add-duplicate/tagHelper

@@ -0,0 +1,37 @@
+<ejs-grid id="Grid" dataSource="@ViewBag.DataSource" height="273" toolbar="@(new List<string>() { "Add", "Edit", "Delete", "Cancel", "Update" })" load="load" actionBegin="actionBegin" created="created">
+    <e-grid-editSettings allowAdding="true" allowDeleting="true" allowEditing="true" mode="Normal"></e-grid-editSettings>
+    <e-grid-columns>
+        <e-grid-column field="OrderID" headerText="Order ID" isPrimaryKey="true" textAlign="Right" width="100" validationRules="@(new{ required = true })"></e-grid-column>
+        <e-grid-column field="CustomerID" headerText="Customer ID" type="string" width="120"></e-grid-column>
+        <e-grid-column field="Freight" headerText="Freight" textAlign="Right" format="C2" editType="numericedit" width="120"></e-grid-column>
+        <e-grid-column field="ShipCountry" headerText="Ship Country" width="150"></e-grid-column>
+    </e-grid-columns>
+</ejs-grid>
+
+<script>
+    var grid;
+    function created() {
+        grid = this;
+    }
+    function orderIdCustomValidation(args) {
+        return (grid.dataSource).every((data) => {
+            return data['OrderID'] + '' !== args['value'] || data['OrderID'] === grid.editModule.editModule.args.rowData['OrderID']
+        });
+    };
+    var orderIDRules = {
+        required: true,
+        min: [orderIdCustomValidation, 'The entered value already exists in the column OrderID. Please enter a unique value.']
+    };
+    function load(args) {
+        this.columns[1].validationRules = { required: true };
+    }
+    function actionBegin(args) {
+        if (args.requestType === 'save') {
+            grid.editModule.formObj.addRules('OrderID', orderIDRules); // Add form validation rules dynamically.
+            if (!grid.editModule.formObj.validate()) { // Check dynamically added validation rules.
+                args.cancel = true; // Prevent adding duplicate data action.
+            }
+            grid.editModule.formObj.removeRules('OrderID'); // Remove form validation rules dynamically.
+        }
+    }
+</script>

ej2-asp-core-mvc/grid/EJ2_ASP.MVC/editing/edit.md

@@ -192,6 +192,31 @@ In the following code example, the Employee Name is a foreign key column. When e
 | -------------- | ------------- |
 | ![Foreign key column edit](../images/editing/on-foreign-key-column-editing.png) | ![After foreign key column edit](../images/editing/after-foreign-key-column-editing.png) |
 
+## Prevent adding duplicate rows in Syncfusion ASP.NET MVC Grid with custom validation
+
+The Syncfusion ASP.NET MVC Grid allows you to enforce constraints to prevent duplicate rows by customizing the validation logic within the Grid setup. This ensures data integrity by restricting duplicate entries in the **OrderID** column.
+
+To prevent adding duplicate rows in the Grid, follow these steps:
+
+1. Implement Custom Validation: Define the `orderIdCustomValidation` function to check whether the entered **OrderID** already exists in the [dataSource](https://help.syncfusion.com/cr/aspnetmvc-js2/Syncfusion.EJ2.Grids.Grid.html#Syncfusion_EJ2_Grids_Grid_DataSource). This allows editing an existing row without triggering a duplicate error.
+
+2. Add Dynamic Validation Rules: Create the `orderIDRules` object to enforce unique **OrderID** values. Dynamically add this rule to the form during the **save** action.
+
+3. Handle Validation in the [ActionBegin](https://help.syncfusion.com/cr/aspnetmvc-js2/syncfusion.ej2.grids.grid.html#Syncfusion_EJ2_Grids_Grid_ActionBegin) event: In the `ActionBegin` event, check if the **requestType** is **save**. Apply the validation rule before saving and cancel the action `args.cancel = true` if the validation fails.
+
+For server-side validation to prevent adding duplicate rows, you can refer to the detailed guidance provided in our [knowledge base](https://support.syncfusion.com/kb/article/11608/how-to-do-server-side-validation-for-grid-in-asp-net-mvc-application). If you want to display the Grid's validation tooltip instead of the alert used in our knowledge base, you can call the `grid.editModule.formObj.validate()` method in the `Ajax/Fetch` success function to display the Grid's tooltip validation for the server side.
+
+{% tabs %}
+{% highlight razor tabtitle="CSHTML" %}
+{% include code-snippet/grid/edit/prevent-add-duplicate/razor %}
+{% endhighlight %}
+{% highlight c# tabtitle="Edit-temp.cs" %}
+{% include code-snippet/grid/edit/prevent-add-duplicate/customvalidation.cs %}
+{% endhighlight %}
+{% endtabs %}
+
+![Prevent Duplicate row](../images/editing/prevent-duplicate-row.png)
+
 ## How to perform CRUD action externally 
 
 Performing CRUD (Create, Read, Update, Delete) actions externally in the Syncfusion<sup style="font-size:70%">&reg;</sup> Grid allows you to manipulate grid data outside the grid itself. This can be useful in scenarios where you want to manage data operations programmatically.

ej2-asp-core-mvc/grid/EJ2_ASP.NETCORE/editing/edit.md

@@ -192,6 +192,31 @@ In the following code example, the Employee Name is a foreign key column. When e
 | -------------- | ------------- |
 | ![Foreign key column edit](../images/editing/on-foreign-key-column-editing.png) | ![After foreign key column edit](../images/editing/after-foreign-key-column-editing.png) |
 
+## Prevent adding duplicate rows in Syncfusion ASP.NET Core Grid with custom validation
+
+The Syncfusion ASP.NET Core Grid allows you to enforce constraints to prevent duplicate rows by customizing the validation logic within the Grid setup. This ensures data integrity by restricting duplicate entries in the **OrderID** column.
+
+To prevent adding duplicate rows in the Grid, follow these steps:
+
+1. Implement Custom Validation: Define the `orderIdCustomValidation` function to check whether the entered **OrderID** already exists in the [dataSource](https://help.syncfusion.com/cr/aspnetcore-js2/Syncfusion.EJ2.Grids.Grid.html#Syncfusion_EJ2_Grids_Grid_DataSource). This allows editing an existing row without triggering a duplicate error.
+
+2. Add Dynamic Validation Rules: Create the `orderIDRules` object to enforce unique **OrderID** values. Dynamically add this rule to the form during the **save** action.
+
+3. Handle Validation in the [actionBegin](https://help.syncfusion.com/cr/aspnetcore-js2/syncfusion.ej2.grids.grid.html#Syncfusion_EJ2_Grids_Grid_ActionBegin) event: In the `actionBegin` event, check if the **requestType** is **save**. Apply the validation rule before saving and cancel the action `args.cancel = true` if the validation fails.
+
+For server-side validation to prevent adding duplicate rows, you can refer to the detailed guidance provided in our [knowledge base](https://support.syncfusion.com/kb/article/11608/how-to-do-server-side-validation-for-grid-in-asp-net-mvc-application). If you want to display the Grid's validation tooltip instead of the alert used in our knowledge base, you can call the `grid.editModule.formObj.validate()` method in the `Ajax/Fetch` success function to display the Grid's tooltip validation for the server side.
+
+{% tabs %}
+{% highlight cshtml tabtitle="CSHTML" %}
+{% include code-snippet/grid/edit/prevent-add-duplicate/tagHelper %}
+{% endhighlight %}
+{% highlight c# tabtitle="Edit-temp.cs" %}
+{% include code-snippet/grid/edit/prevent-add-duplicate/customvalidation.cs %}
+{% endhighlight %}
+{% endtabs %}
+
+![Prevent Duplicate row](../images/editing/prevent-duplicate-row.png)
+
 ## How to perform CRUD action externally 
 
 Performing CRUD (Create, Read, Update, Delete) actions externally in the Syncfusion<sup style="font-size:70%">&reg;</sup> Grid allows you to manipulate grid data outside the grid itself. This can be useful in scenarios where you want to manage data operations programmatically.