string qry1 = "update tbl_income set amount='" + textBox8.Text + "' where name='" + textBox2.Text + "'";
insert into table1(field1,field2) SELECT '1','Test1' Union all SELECT '2','Test2'
In SQL Server 2008, you can insert multiple records like this:
insert into table1(field1,field2) values('1','Test1'),('2','Test2')