syntax error in insert statement

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C#

i m running a program using access as database but when i m storing date it shows me error as:-

"syntax error in insert statement"

the code m using is :-

string instr = "insert into [MST_QUOTATION] (Quotation_No,Customer_ID,Customer_Name,Address,Zipcode,Email,Contact,Date)values(100001,3,'Tejas','ABCDSDF',382346,'vvvjh@hv',442122121,'" + abc + "')";

or

string instr = "insert into [MST_QUOTATION] (Quotation_No,Customer_ID,Customer_Name,Address,Zipcode,Email,Contact,Date)values(100001,3,'Tejas','ABCDSDF',382346,'vvvjh@hv',442122121,'2013-02-10')";