linq update
linqupdateDataContext lu = new linqupdateDataContext();
linq l = lu.linqs.Single(linq => linq.name == TextBox1.Text);
l.age = Convert.ToInt32( TextBox2.Text);
lu.SubmitChanges();
linq insert
linqupdateDataContext lu = new linqupdateDataContext();
linq l = new linq();
l.name = TextBox1.Text;
l.age = Convert.ToInt32(TextBox2.Text);
lu.linqs.InsertOnSubmit(l);
lu.SubmitChanges();
linq delete
linqupdateDataContext lu= new linqupdateDataContext();
linq l = lu.linqs.Single(linq => linq.name == TextBox1.Text);
lu.linqs.DeleteOnSubmit(l);
lu.SubmitChanges();
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