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You can show the validation tooltip in SfDataGrid without hovering the red indicator. For this, you need to write style for GridCell and set the ValidationToolTip.IsOpen property as true HasError visual state and false in NoError visual state. XAML: <Style TargetType="syncfusion:GridCell">
<Setter Property="Background" Value="Transparent" />
<Setter Property="BorderBrush" Value="Gray" />
<Setter Property="BorderThickness" Value="0,0,1,1" />
<Setter Property="Padding" Value="0,0,0,0" />
<Setter Property="FontFamily" Value=" Segoe UI" />
<Setter Property="VerticalContentAlignment" Value="Center" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="syncfusion:GridCell">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="IndicationStates">
<VisualState x:Name="HasError">
<Storyboard>
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="PART_InValidCellBorder" Storyboard.TargetProperty="Width">
<EasingDoubleKeyFrame KeyTime="0" Value="0" />
<EasingDoubleKeyFrame KeyTime="0" Value="10" />
</DoubleAnimationUsingKeyFrames>
<!--Set the IsOpen property as True for the ValidationToolTip-->
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationToolTip" Storyboard.TargetProperty="IsOpen">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<x:Boolean>True</x:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="NoError">
<Storyboard BeginTime="0">
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="PART_InValidCellBorder" Storyboard.TargetProperty="Width">
<EasingDoubleKeyFrame KeyTime="0" Value="1" />
<EasingDoubleKeyFrame KeyTime="0" Value="0" />
</DoubleAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="PART_InValidCellBorder" Storyboard.TargetProperty="(UIElement.Visibility)">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Collapsed</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<!--Set the IsOpen property as False for the ValidationToolTip-->
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationToolTip" Storyboard.TargetProperty="IsOpen">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<x:Boolean>False</x:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="BorderStates">
<VisualState x:Name="NormalCell" />
<VisualState x:Name="FooterColumnCell">
<Storyboard BeginTime="0">
<ObjectAnimationUsingKeyFrames BeginTime="0"
Duration="1"
Storyboard.TargetName="PART_GridCellBorder"
Storyboard.TargetProperty="BorderThickness">
<DiscreteObjectKeyFrame KeyTime="0" Value="1,0,1,1" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="BeforeFooterColumnCell">
<Storyboard BeginTime="0">
<ObjectAnimationUsingKeyFrames BeginTime="0"
Duration="1"
Storyboard.TargetName="PART_GridCellBorder"
Storyboard.TargetProperty="BorderThickness">
<DiscreteObjectKeyFrame KeyTime="0" Value="0,0,0,1" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border Background="{TemplateBinding CellSelectionBrush}" Visibility="{TemplateBinding SelectionBorderVisibility}" />
<Border x:Name="PART_GridCellBorder"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<Grid>
<ContentPresenter Margin="{TemplateBinding Padding}"
FontFamily="{TemplateBinding FontFamily}"
FontSize="{TemplateBinding FontSize}"
Foreground="{TemplateBinding Foreground}" />
</Grid>
</Border>
<Border Margin="0,0,0,0"
Background="Transparent"
BorderBrush="{TemplateBinding CurrentCellBorderBrush}"
BorderThickness="{TemplateBinding CurrentCellBorderThickness}"
IsHitTestVisible="False"
Visibility="{TemplateBinding CurrentCellBorderVisibility}" />
<Border x:Name="PART_InValidCellBorder"
Width="10"
Height="10"
HorizontalAlignment="Right"
VerticalAlignment="Top">
<ToolTipService.ToolTip>
<ToolTip Name="ValidationToolTip"
Background="#FFDB000C"
Placement="Right"
Tag="{TemplateBinding ErrorMessage}"
Template="{StaticResource ValidationToolTipTemplate}" />
</ToolTipService.ToolTip>
<Path Data="M0.5,0.5 L12.652698,0.5 12.652698,12.068006 z"
Fill="Red"
Stretch="Fill" />
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Note: This workaround only recommended when you show the validation errors using CurrentCellValidating or RowValidating events. If you set this when built-in validation (using DataErrorInfo, INotifyDataErrorInfo and Data Annotations) enabled, then tooltip will be displayed in all the cells which has error.
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