Answer / manikanta.srinu

No it doesn't necessarily speed up operations. It is part
of ADO.NET
LINQ to SQL is not necessarily going to speed up data
access code. Since LINQ to SQL is abstraction over the low
level ADO.NET command and connection classes, it's bound to
be a bit slower at runtime (but hopefully faster to develop
with).

If(dropdownlist1.selectedIndexChanged==true) { //code } else { //code } I am getting error in If condition, so can u pls give me a solution.

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