DateAdapterDelete

using (Conn = new SqlConnection(ConnectionString))
{
   //DataAdapter删除数据
   Conn.Open();//打开数据库连接
   string sqlstr = "select * from UserInfo2 where UserName = @UserName";
   SqlDataAdapter da = new SqlDataAdapter();
   SqlCommand deletecmd = new SqlCommand(sqlstr, Conn);
   deletecmd.Parameters.Add("@UserName", SqlDbType.VarChar, 50).Value = "小王";
   SqlCommandBuilder cb = new SqlCommandBuilder(da);//自动生成插入数据的SQL语句，不能少
   da.SelectCommand = deletecmd;
   DataSet ds = new DataSet();
   int count = da.Fill(ds, "UserInfo2");
   if (count > 0)
   {
      ds.Tables["UserInfo2"].Rows[0].Delete();//删除行数据
      da.Update(ds, "UserInfo2");
   }
   ds.Clear();
   Response.Write("删除数据成功！");
}