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[.net] large image loading

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Hi I want to show a large image in C#,but I recieve Out of memory error. how can I read the smaller block of my picture and show it.I work with GDI+. here is my code .I try to load one part of my picture but at last line of my code I recieve this error.my image is 20MB jpg with 12000*14000 Image MapImage = null; MapImage1 = Image.FromFile("filename.jpg"); Rectangle recDes1 = new Rectangle(0, 0, 1000, 1000); Rectangle recSrc1 = new Rectangle(0, 0, 1000, 1000); gr.DrawImage(MapImage1, recDes1, recSrc1, GraphicsUnit.Pixel); by regards

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