Three stops LinearGradientBrush
<Window x:Class="Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="GradientBackground" Height="150" Width="200">
<Grid>
<Grid.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
<GradientStop Color="Red" Offset="0" />
<GradientStop Color="White" Offset="0.5" />
<GradientStop Color="Blue" Offset="1" />
</LinearGradientBrush>
</Grid.Background>
</Grid>
</Window>
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