in wpf, change the color of button

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C#

i want change the color of resetbutton on click
c# function

private void ReasetButtonClick(object sender, RoutedEventArgs e)
{
int count =110000;
resetbutton.Background = (Brush)FindResource("MySelectedButtonOrangeGradientBrush");
applybutton.Background = SystemColors.ControlLightLightBrush;


while (count>0)
{



count--;

}

resetbutton.Background = SystemColors.ControlLightLightBrush;
int retval = BLLWrapper.BLLIsAdmin();
if (retval == 0)
MessageBox.Show(Properties.Resources.NO_ADMIN_PRIVILEDGES);
else
{
proxformate = 0;
RadioButtonRaw.IsChecked = true;
// proxformate = 254;
//RadioButtonAuto.IsChecked = true;
// BLLWrapper.BLLSaveProxFormat(proxformate);

}

}









wpf file

<UserControl x:Class="HID_okworkbench.ProxCardSettingContent"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" FontFamily="Tahoma" FontSize="11"

    Height="auto" Width="auto" Background="{DynamicResource MyBlueBackgroundGradientBrush}" >

    <TabControl Background="{DynamicResource MyBlueBackgroundGradientBrush}" >

        <TabItem Header="Proxcard Setting" PreviewKeyUp="UserControl_PreviewKeyUp" PreviewKeyDown="UserControl_PreviewKeyDown">

            <Grid Margin="0,0,20,10" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >

                <Grid.RowDefinitions>

                    <RowDefinition Height=".920*"/>

                    <RowDefinition Height=".080*"/>

                </Grid.RowDefinitions>

                <GroupBox Header="ATR decoding Format" Grid.Row="0" Margin="50,50,50,20" >

                    <Grid>

                        <Grid.ColumnDefinitions>

                            <ColumnDefinition/>

                            <ColumnDefinition/>

                        </Grid.ColumnDefinitions>

                        <Grid.RowDefinitions>

                            <RowDefinition/><rowdefinition />
                            <rowdefinition />
                            <rowdefinition />
                        
                        <radiobutton name="RadioButtonRaw" grid.row="0" grid.column="0" horizontalalignment="Left" verticalalignment="Center" margin="40,0,0,0">Raw</radiobutton>
                        <radiobutton name="RadioButtonH10301" grid.row="1" grid.column="0" horizontalalignment="Left" verticalalignment="Center" margin="40,0,0,0">H10301</radiobutton>
                        
                    
                
               
                    
                    <Button Name="resetbutton" Grid.Column="2" Click="ReasetButtonClick">
                        <Button.Content>
                            <textblock>
                                <underline>R</underline>eset
                            </textblock>
                        </Button.Content>
                    </Button>