importing excel sheet in c#

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C#

C#4.0

hi
i need to import excel sheet

that excel sheet contains suppose 3 worksheet

eg:Sheet1,sheet 2,sheet3,

after importing that work sheet attached as a node to treecontol

and when i doubbled click on that node the content of that work sheet display in datagrid view

each sheet contaion 1200 row and 5 column named as a,b,c,d,e

and each column contaion some data ..

please help me out..
in c# winform..