i have code in my shader and i want to be able for when it compile the shader it pics the correct "technique"

at the moement it says there is a redefinition of shader name , i would like to keep the names the same and want to put a block around each one like

#if(DX11)

#endif

but i not sure on what to put , can this be done ?

technique11 Sprite
{
    pass P0
    {
        SetVertexShader( CompileShader( vs_5_0, TextureVertexShader() ) );
SetHullShader( NULL );
        SetDomainShader( NULL );
        SetGeometryShader( NULL );  
        SetGeometryShader( NULL );                                   
        SetPixelShader( CompileShader( ps_5_0, TexturePixelShader() ) );                                  


// Switch off blending states
// SetBlendState( NoBlending, float4( 0.0f, 0.0f, 0.0f, 0.0f ), 0xFFFFFFFF );
SetRasterizerState( CullBack ); 
SetDepthStencilState( DepthWritesOff, 0 );
}
}


technique10 Sprite
{
    pass P0
    {
        SetVertexShader( CompileShader( vs_4_0, TextureVertexShader() ) );
//SetHullShader( NULL );
       // SetDomainShader( NULL );
       // SetGeometryShader( NULL );  
       // SetGeometryShader( NULL );                                   
        SetPixelShader( CompileShader( ps_4_0, TexturePixelShader() ) );                                  


// Switch off blending states
// SetBlendState( NoBlending, float4( 0.0f, 0.0f, 0.0f, 0.0f ), 0xFFFFFFFF );
SetRasterizerState( CullBack ); 
SetDepthStencilState( DepthWritesOff, 0 );
}
}