unable to insert values into Excel when column name contains # sign

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ASP.NET

C#3.5

MS-Excel

Hi All,
iam facing an issue iam able to insert values into my excel file using c# successfully .but when my column name contains "#" ex Target_Group#, iam getting error unknown column name but in my excel the column name is there "Target_Group# ", pls find my insert Query

string query = "INSERT INTO [Sheet2$] ([Target_Group#]) VALUES('OHMCRWP0')"

iam using oledb connections pls help me out on this.