Added new kb article grid-filter-with-dynamically-created-filter-expressions (#532)

* Added new kb article grid-filter-with-dynamically-created-filter-expressions

* kb(grid): adjust article

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Co-authored-by: KB Bot <[email protected]>
Co-authored-by: P1l3T0 <[email protected]>

Author: 3 people

knowledge-base/grid-filter-with-dynamically-created-filter-expressions.md

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+---
+title: Filter with dynamically created filter expressions
+description: This article provides instructions on how to filter with dynamically created filter expressions
+type: how-to
+page_title: Filter with dynamically created filter expressions. | RadGrid
+slug: grid-filter-with-dynamically-created-filter-expressions
+tags: radgrid, filtering, buttons, rows
+res_type: kb
+---
+
+## Environment
+
+<table>
+	<tbody>
+		<tr>
+			<td>Product</td>
+			<td>Telerik WebForms Grid for ASP.NET AJAX</td>
+		</tr>
+	</tbody>
+</table>
+
+## Description
+
+I want to implement buttons to filter rows in a step-by-step process. The process involves listing and filtering rows in a Grid based on specific intervals. 
+
+## Solution
+
+To achieve the desired behavior, you can follow these steps:
+
+1. Add a Filter control with the `Visible` property set to **false** to your page.
+2. Create buttons in the header (or wherever you want) of a GridTemplateColumn in your RadGrid to trigger the filtering.
+3. Handle the button click events and programmatically create filter expressions based on the given conditions.
+4. Apply the filter expressions to the Grid and remove them after filtering is done.
+
+Here's a sample implementation for the first scenario using buttons in the header of a GridTemplateColumn:
+
+````ASP.NET
+<telerik:RadFilter RenderMode="Lightweight" runat="server" ID="RadFilter1" FilterContainerID="RadGrid1" Visible="false" />
+<telerik:RadGrid ID="RadGrid1" runat="server" AllowPaging="True" Width="800px" OnNeedDataSource="RadGrid1_NeedDataSource">
+    <MasterTableView AutoGenerateColumns="true" DataKeyNames="OrderID">
+        <Columns>
+            <telerik:GridTemplateColumn DataField="OrderID" DataType="System.Int32" FilterControlAltText="Filter OrderID column" HeaderText="OrderID" ReadOnly="True" SortExpression="OrderID" UniqueName="OrderID">
+                <HeaderTemplate>
+                    <telerik:RadButton runat="server" ID="Step1Button" Text="Step1-button" OnClick="Step1Button_Click" />
+                    <telerik:RadButton runat="server" ID="Step2Button" Text="Step2-button" OnClick="Step2Button_Click" />
+                </HeaderTemplate>
+                <ItemTemplate>
+                    <telerik:RadLabel runat="server" ID="label1" Text='<%# Bind("OrderID") %>' />
+                </ItemTemplate>
+            </telerik:GridTemplateColumn>
+        </Columns>
+    </MasterTableView>
+</telerik:RadGrid>
+````
+
+In the code-behind file, handle the button click events and create the filter expressions:
+
+````C#
+protected void Step1Button_Click(object sender, EventArgs e)
+{
+    RadFilterGreaterThanOrEqualToFilterExpression<int> expr1 = new RadFilterGreaterThanOrEqualToFilterExpression<int>("OrderID");
+    expr1.Value = 1;
+    RadFilter1.RootGroup.AddExpression(expr1);
+
+    RadFilterGroupExpression group1 = new RadFilterGroupExpression();
+    group1.GroupOperation = RadFilterGroupOperation.And;
+
+    RadFilterLessThanOrEqualToFilterExpression<int> expr2 = new RadFilterLessThanOrEqualToFilterExpression<int>("OrderID");
+    expr2.Value = 61;
+    RadFilter1.RootGroup.AddExpression(expr2);
+
+    RadFilter1.FireApplyCommand();
+
+    RadFilter1.RootGroup.Expressions.Remove(expr1);
+    RadFilter1.RootGroup.Expressions.Remove(expr2);
+}
+
+protected void Step2Button_Click(object sender, EventArgs e)
+{
+    RadFilterGreaterThanOrEqualToFilterExpression<int> expr1 = new RadFilterGreaterThanOrEqualToFilterExpression<int>("OrderID");
+    expr1.Value = 61;
+    RadFilter1.RootGroup.AddExpression(expr1);
+
+    RadFilterGroupExpression group1 = new RadFilterGroupExpression();
+    group1.GroupOperation = RadFilterGroupOperation.And;
+
+    RadFilterLessThanOrEqualToFilterExpression<int> expr2 = new RadFilterLessThanOrEqualToFilterExpression<int>("OrderID");
+    expr2.Value = 150;
+    RadFilter1.RootGroup.AddExpression(expr2);
+
+    RadFilter1.FireApplyCommand();
+
+    RadFilter1.RootGroup.Expressions.Remove(expr1);
+    RadFilter1.RootGroup.Expressions.Remove(expr2);
+}
+````
+
+This implementation allows you to filter the Grid based on the given conditions by clicking the corresponding buttons in the header.
+
+Remember to adjust the column and filter expressions based on your specific requirements.
+
+## See Also
+
+- [Working with Expressions]({%slug filter/filter-expressions/working-with-expressions%})
+
+