Added UG content for Grid cell border customization.

Author: SowntharyaJ

MAUI/DataGrid/Images/conditional-styling/maui-datagrid-conditional-datagridcelltyle_bordercolor_basedon_rowcolumnindex.png

@@ -390,6 +390,64 @@ public class ForeColorConverter : IValueConverter
 
 ![Conditional cell styling based on RowIndex and ColumnIndex in .NET MAUI DataGrid](Images/conditional-styling/maui-datagrid-conditional-datagridcelltyle_basedon_rowcolumnindex.png)
 
+## Customizing Border Color for a Specific Cell in SfDataGrid
+You can apply styling to a specific cell in the SfDataGrid by targeting the DataGridCell and using the RowIndex and ColumnIndex properties along with the BorderColor property. This allows you to customize the appearance of individual cells, such as setting a unique border color. Additionally, you can customize the thickness of the border using the [GridLineStrokeThickness](https://help.syncfusion.com/cr/maui/Syncfusion.Maui.DataGrid.DataGridStyle.html#Syncfusion_Maui_DataGrid_DataGridStyle_GridLineStrokeThicknessProperty) property.
+
+{% tabs %}
+{% highlight xaml tabtitle="MainPage.xaml" %}
+<ContentPage xmlns:syncfusion=http://schemas.syncfusion.com/maui>
+   <ContentPage.Resources>
+       <ResourceDictionary>
+           <local:BorderColorConverter x:Key="converter" />
+           <Style TargetType="syncfusion:DataGridCell">
+               <Setter Property="BorderColor" Value="{Binding Source={RelativeSource Mode=Self}, Converter={StaticResource converter}}" />
+           </Style>
+       </ResourceDictionary>
+   </ContentPage.Resources>
+
+   <ContentPage.Content>
+       <Grid>
+          <syncfusion:SfDataGrid x:Name="dataGrid"
+                                 ItemsSource="{Binding OrderInfoCollection}"
+                                 GridLinesVisibility="Both">
+              
+    <syncfusion:SfDataGrid.DefaultStyle>
+        <syncfusion:DataGridStyle GridLineStrokeThickness="5" />
+    </syncfusion:SfDataGrid.DefaultStyle>
+          </syncfusion:SfDataGrid>
+        </Grid>
+   </ContentPage.Content>
+</ContentPage>
+{% endhighlight %}
+{% highlight xaml tabtitle="BorderColorConverter.cs" %}
+
+public class BorderColorConverter : IValueConverter
+{
+   public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+   {
+       var gridCell = value as DataGridCell;
+ 
+       if (gridCell != null)
+       {
+           if (gridCell.DataColumn!.RowIndex == 4 && gridCell.DataColumn.ColumnIndex == 3)
+               return Colors.Blue;
+ 
+           return Colors.Transparent;
+       }
+
+       return Colors.Transparent;
+   }
+
+   public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+   {
+       throw new NotImplementedException();
+   }
+}
+{% endhighlight %}
+{% endtabs %}
+
+![Conditional cell styling based on RowIndex and ColumnIndex in .NET MAUI DataGrid](Images/conditional-styling/maui-datagrid-conditional-datagridcelltyle_bordercolor_basedon_rowcolumnindex.png)
+
 ## Style a cell based on cell value
 Styling can be applied to a particular cell based on CellValue property by writing the style for the [DataGridCell](https://help.syncfusion.com/cr/maui/Syncfusion.Maui.DataGrid.DataGridCell.html) TargetType.