How to change the color of a row in the DataGrid in C #?

This code snippet changes the color of the selected row from the DataGrid myDataGrid to red.

int selectedIndex = myDataGrid.SelectedIndex;
//Guarda a Row selecionada
DataGridRow row = 
          myDataGrid.ItemContainerGenerator.ContainerFromIndex(selectedIndex) as DataGridRow;
if(row == null)//A linha selecionada não está visivel
{
   object item = myDataGrid.Items[selectedIndex];
   myDataGrid.ScrollIntoView(item);//Torna a linha selecionada visivel
   row = myDataGrid.ItemContainerGenerator.ContainerFromIndex(selectedIndex) as DataGridRow;
}
//Altera a cor para vermelho
row.Background = Brushes.Red;

Note:
The SelectionUnit property of myDataGrid must be as FullRow     

Conditional styling with WPF

You can also do validations in WPF, using datatriggers . Note that this code snippet is located in Application.xaml , inside the Application.Resources p>

 <Style TargetType="DataGridRow">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Path=Tipo}" Value="Erro">
                    <Setter Property="Background">
                        <Setter.Value>
                            <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                <GradientStop Color="White" Offset="0.2"/>
                                <GradientStop Color="#ffb1b1" Offset="0.85"/>
                                <GradientStop Color="WhiteSmoke" Offset="1"/>
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>
                    <Setter Property="FontWeight" Value="Bold"/>
                </DataTrigger>

                <DataTrigger Binding="{Binding Path=Tipo}" Value="Aviso">
                    <Setter Property="Background">
                        <Setter.Value>
                            <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                <GradientStop Color="White" Offset="0.2"/>
                                <GradientStop Color="#ffee86" Offset="0.85"/>
                                <GradientStop Color="WhiteSmoke" Offset="1"/>
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>
                    <Setter Property="FontWeight" Value="Bold"/>
                </DataTrigger>

                <DataTrigger Binding="{Binding Path=Tipo}" Value="Info">
                    <Setter Property="Background">
                    <Setter.Value>
                        <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                            <GradientStop Color="White" Offset="0.2"/>
                            <GradientStop Color="#c6deff" Offset="0.85"/>
                            <GradientStop Color="WhiteSmoke" Offset="1"/>
                        </LinearGradientBrush>
                    </Setter.Value>
                </Setter>
                    <Setter Property="FontWeight" Value="Bold"/>
                </DataTrigger>

                <DataTrigger Binding="{Binding Path=Tipo}" Value="Sucesso">
                    <Setter Property="Background">
                        <Setter.Value>
                            <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
                                <GradientStop Color="White" Offset="0.2"/>
                                <GradientStop Color="#c6ffc7" Offset="0.85"/>
                                <GradientStop Color="WhiteSmoke" Offset="1"/>
                            </LinearGradientBrush>
                        </Setter.Value>
                    </Setter>
                    <Setter Property="FontWeight" Value="Bold"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>

In this example, the applied filters went to the Type column. The value tag is assigned to, for example: If the line has the Error value in the column, then the line will be in the color you assign. If you do not master WPF, you you can create% other than% I created in the example, which applies to the setters Background, such as:

<Setter Property="OverridesDefaultStyle" Value="True"/>
<Setter Property="Margin" Value="1"/>
<Setter Property="FontFamily" Value="Tahoma"/>
<Setter Property="FontSize" Value="11px"/>
<Setter Property="FontWeight" Value="Normal"/>

For more information on this Styles / Templates, click here