protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        int computer_number = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value); //取出要删除记录的主键值 (这里对你略作了修改,不清楚你的主键用得是啥类型,不过看number这个单词,以及常理来判断一般主键是int型)
        string scon = ConfigurationManager.ConnectionStrings["xmelmisConnectionString"].ConnectionString; //取出连接字符串 (其实这里多写scon变量是多余的,不过你既然这么做了么...就这样吧)
        string str = "delete from computer_equipment where computer_number=@computer_number";
        SqlConnection conn = new SqlConnection(scon);//打造连接对象其实没必要放try里,try..catch其实是会消耗资源的,要尽量避免大段"不会发生异常的代码"往try里面扔
        SqlCommand comm = new SqlCommand(str, conn);
        comm.Parameters.AddWithValue("@computer_number", computer_number);//AddWithValue方法,相当有用地
        try
        {
            if (conn.State == ConnectionState.Closed)
                conn.Open();
            comm.ExecuteNonQuery();          //执行删除 
            comm.Dispose();
        }
        catch (Exception ex)
        {
            Response.Write("数据库错误，错误原因：" + ex.Message);
            Response.End();
        }
        finally
        {
            if (conn.State == ConnectionState.Open)//这句一般扔finally 块里
                conn.Close();
        }
        GridView1.EditIndex = -1;  //这样也是..没必要扔try块里
        gridviewBind();
    }