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+---
+title: Virtual Scrolling Does Not Work
+description: How to fix Virtual Scrolling does not work and does not load data
+type: troubleshooting
+page_title: Virtual Scrolling - Not Working
+slug: grid-kb-virtual-scrolling-troubleshooting
+position:
+tags:
+res_type: kb
+---
+
+## Environment
+<table>
+	<tbody>
+		<tr>
+			<td>Product</td>
+			<td>Grid for Blazor</td>
+		</tr>
+	</tbody>
+</table>
+
+
+## Description
+I have a Grid with [Virtual Scrolling]({%slug components/grid/virtual-scrolling%}) enabled. When I scroll up or down the rows for the current view port are not rendered as the loading indicator remains visible as shown in the image below.
+
+>caption A depiction of the problem and symptom
+
+![](images/virtual-scrolling-loading-indicator.png)
+
+
+## Cause\Possible Cause(s)
+
+There are several common causes for that behavior:
+
+* The rendered row height in the browser does not match the value set to the `RowHeight` parameter of the Grid. This depends on the used Theme and / or custom CSS rules applied to the `<tr>` HTML tag.
+
+* The `RowHeight` parameter changes on runtime. Changing the height of the row dynamically depending on the content will cause issues with the virtualization logic.
+
+* The browser and monitor settings do not match the settings of the Grid. Different browser zoom levels and monitor DPI (not set to 100%) can cause the browser to render the rows with unexpected dimensions and / or non-integer values of the `<tr>`.
+
+>caption Typical PROBLEMATIC example when using Virtual Scrolling
+
+````CSHTML
+@*This example showcases typical situation when the Virtual Scrolling will break*@
+
+<TelerikGrid Data=@GridData
+             ScrollMode="@GridScrollMode.Virtual"
+             Height="480px" 
+             
+             RowHeight="20"
+             
+             PageSize="20" Sortable="true" FilterMode="@GridFilterMode.FilterMenu">
+    <GridColumns>
+        <GridColumn Field="Id" />
+        <GridColumn Field="Name" Title="First Name" />
+        <GridColumn Field="LastName" Title="Last Name" />
+        <GridColumn Field="HireData" Width="200px">
+            <Template>
+                @((context as SampleData).HireDate.ToString("MMMM dd, yyyy"))
+            </Template>
+        </GridColumn>
+    </GridColumns>
+</TelerikGrid>
+
+@code {
+    public List<SampleData> GridData { get; set; }
+
+    protected override async Task OnInitializedAsync()
+    {
+        GridData = await GetData();
+    }
+
+    private async Task<List<SampleData>> GetData()
+    {
+        return Enumerable.Range(1, 1000).Select(x => new SampleData
+        {
+            Id = x,
+            Name = $"name {x}",
+            LastName = $"Surname {x}",
+            HireDate = DateTime.Now.Date.AddDays(-x)
+        }).ToList();
+    }
+
+    public class SampleData
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public string LastName { get; set; }
+        public DateTime HireDate { get; set; }
+    }
+}
+````
+
+
+## Solution
+Set the `RowHeight` parameter to a fixed value in pixels so that it accommodates the content (depending on the content, padding, margins, font-size and other rules and settings on your app such the Theme and CSS related rules) and matches the monitor and browser settings.
+
+You can read more in the [Notes section of the Virtual Scrolling article]({%slug components/grid/virtual-scrolling%}).
diff --git a/knowledge-base/images/virtual-scrolling-loading-indicator.png b/knowledge-base/images/virtual-scrolling-loading-indicator.png
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