Command binding is not working - wpf

Question

I have a user control where one text box and button is there
<UserControl x:Class="Search.View.SearchView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:viewModel="clr-namespace:Search.ViewModel" x:Name="SearchUserControl"
mc:Ignorable="d"
d:DesignHeight="50" d:DesignWidth="250" DataContext="{DynamicResource SearchViewModel}">
<UserControl.Resources>
<viewModel:SearchViewModel x:Key="SearchViewModel"></viewModel:SearchViewModel>
</UserControl.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<StackPanel Orientation="Horizontal" Grid.Column="0" HorizontalAlignment="Right">
<TextBox x:Name="TxtSearch" Height="20" Width="100"></TextBox>
<Button x:Name="BtnSearchButton" Content="Search" Height="20" Command="{Binding SearchCommand}" Width="Auto" Margin="5,0,5,0" ></Button>
</StackPanel>
</Grid>
</UserControl>
in in my ViewModel file :
public RelayCommand SearchCommand { get; set; }
public SearchViewModel()
{
SearchCommand = new RelayCommand(TestSearch);
}
public void TestSearch(object p)
{
}
when i am using this user control on any view . Command binding is not working any help will be highly appreciated