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RenderTarget2D not saving

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Hello. I am rendering a scene to a render target and trying to save it to a file, but the picture that is created is always blank(as in it is 0k, not even black pixels are created), I don't know what else to do. The rendering works perfectly so I know things are actually getting rendered, it is just not saving to an image. Here is my code.

RenderTarget2D RenderTarget = new RenderTarget2D(CRenderManager.Singleton.GetGD(), 128, 128, false, SurfaceFormat.Color, DepthFormat.Depth24, 0, RenderTargetUsage.PreserveContents);

CRenderManager.Singleton.GetEffect().World = Matrix.CreateTranslation(-pos.getVector3df()) ;
CRenderManager.Singleton.GetEffect().VertexColorEnabled = false;
foreach (EffectPass pass in CRenderManager.Singleton.GetEffect().CurrentTechnique.Passes)
CRenderManager.Singleton.GetGD().Indices = patch.GetIB();
CRenderManager.Singleton.GetGD().DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, patch.GetVB().VertexCount, 0, patch.GetIB().IndexCount);
RenderTarget.SaveAsPng(File.OpenWrite("RENDER.png"), RenderTarget.Width, RenderTarget.Height);

Any ideas? Edited by ShadowMan777

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That was it. Thank you so much. I didn't even think about it because I wasn't creating a stream object so I didn't think about closing it.

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