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OleDbConnection connection = new OleDbConnection("connectionstring");
String strCom = String.Format(@"INSERT INTO Rent (memID , bookID , rentDate) VALUES
                ('{0}','{1}','{2}') UPDATE Book bookStatus ='1' WHERE bookID ='{3}' )",txtMemID.Text , txtBookID.Text, dtp.Value.ToShortDateString(),txtBookID.Text);
 
OleDbCommand command= new OleDbCommand (strConn, connection );
connection.Open();
command.ExecuteNonQuery();
connection.Close();
 
 

prog.cs(1,17): error CS0116: A namespace can only contain types and namespace declarations
prog.cs(2,8): error CS0116: A namespace can only contain types and namespace declarations
prog.cs(5,14): error CS0116: A namespace can only contain types and namespace declarations
prog.cs(6,16): error CS8025: Parsing error
Compilation failed: 4 error(s), 0 warnings

Standard output is empty