well its pretty much the exact same code for a windows form, the calls to SQL server are irralavant to the fact that its win forms or a web app. you still need a :

Connection Object
Command Object
Parameters
Execution block

Code:
using(SqlConnection conn = new SqlConnection(ConfigruationManager.ConnectionStrings["myConStr"])){ 
 
 SqlCommand cmd  = new SqlCommand("INSERT STATEMENT", conn); 
cmd.Parameters.AddWithValue("@myParm1",Value1); 
....
try{ 
   conn.open(); 
   cmd.ExecuteNonQuery(); 
   conn.close()
}
catch(SqlException ex){ 
   throw(ex);
} 
}
hth,
mcm

}