LinQ Insert, Update

First to Insert just
Create New object of your mapping
ex: class MyuserList
string username;
int age;

MyuserList a=new MyuserList();
a.username="cipto";
a.age="26";

or Dynamicinsert(a);

Mydatacontext tmp=new Mydatacontext();
tmp.insertonsubmit(a);

For Update
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just get the recod and change the properti and then
submitchanges();=>everything is update to DB