How long is the effective duration of effect state in shader code

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How long is the effective duration of effect state in shader code? Like the "ZEnable" in shader code. The effective duration is only the pass? Or persist the RenderState of ZEnable=FALSE when exit the pass?
technique TShadowQVSM_ADPATIVE3 //UpdateShadowResultTextureForDeferredShading
{
pass p0
{

ZWriteEnable=FALSE;
ZEnable=FALSE;
}
}



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Quote:
 From DX SDK:An application sets one active technique in the effect system by calling ID3DXEffect::Begin. The effect system responds by capturing all the pipeline state that can be changed by the technique in a state block. An application signals the end of a technique by calling ID3DXEffect::End, which uses the state block to restore the original state. The effect system therefore takes care of saving state when a technique becomes active and restoring state when a technique ends. If you choose to disable this save and restore functionality, see D3DXFX_DONOTSAVESAMPLERSTATE.

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