Why do we use interface in c#?

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code to generate a excel sheet and to write data into it --- -it has to fetch the excel sheet which is in one folder placed by us inside a project folder(i,e it has to create a instance of that excel sheet) and write the data into it row by row please respond as early as possible

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can you declare an override method to be static if the original method is not static?

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What is option parameter in C#?

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What is arraylist?

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What is the use of console readline () in c#?

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Difference between debug.write and trace.write?

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Why can't we use a static class instead of singleton?

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What does the keyword virtual mean in the method definition?

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Name the control which cannot be placed in mdi?

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Define sealed classes in c#?

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Which is faster iqueryable or ienumerable?

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