回答編集履歴
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@@ -16,4 +16,63 @@
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ASP.NET Web Forms アプリなら ModalPopup も選択肢に入ると思います。
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ModalPopup Demonstration
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[https://ajaxcontroltoolkit.devexpress.com/ModalPopup/ModalPopup.aspx](https://ajaxcontroltoolkit.devexpress.com/ModalPopup/ModalPopup.aspx)
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[https://ajaxcontroltoolkit.devexpress.com/ModalPopup/ModalPopup.aspx](https://ajaxcontroltoolkit.devexpress.com/ModalPopup/ModalPopup.aspx)
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**【追記】**
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下の 2018/08/27 14:46 の私のコメントで「<div class="page"> を真ん中に持ってくるので良ければ CSS でできると思います。回答欄にサンプルを追記しておきます」と書きましたが、それを以下に書きます。
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これがこのまま質問者さんのケースに適用できるかまでは調べてませんが、直接は適用できなくても、応用でやりたいことは実現可能かと思います。
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```
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<%@ Page Language="C#" AutoEventWireup="true"
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CodeFile="0049-Centering.aspx.cs" Inherits="_0049_Centering" %>
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head runat="server">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<title></title>
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<style type="text/css">
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body {
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background: #555;
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}
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.content {
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background: white;
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width:500px;
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height:300px;
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position:absolute;
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top:50%;
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left:50%;
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margin-left:-250px;
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margin-top:-150px;
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overflow:scroll;
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}
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</style>
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</head>
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<body>
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<form id="form1" runat="server">
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<div class="content">
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<h1>This page is horizontally / vaerically centered on
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screens that are wider than 500 / 300 pixels.</h1>
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<h2>Resize the browser window to see the effect.</h2>
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<p>An absolutely positioned element is an element whose computed position value is absolute or fixed.
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The top, right, bottom, and left properties specify offsets from the edges of the element's containing block.
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(The containing block is the ancestor relative to which the element is positioned.)
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If the element has margins, they are added to the offset.</p>
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</div>
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</form>
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</body>
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</html>
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```
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結果は以下の通り。ブラウザは Chrome 68.0.3440.106 です。
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css の position の説明については以下の記事を見てください。
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position
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[https://developer.mozilla.org/en-US/docs/Web/CSS/position](https://developer.mozilla.org/en-US/docs/Web/CSS/position)
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