 <p>You can save popup window's text in webpart property in toolpart.</p> <p>This property will be accessed in WebPart &amp; ToolPart also.</p> <p>For WebPart Properties see below example,</p> <pre><code> [Personalizable(PersonalizationScope.Shared)] [WebBrowsable(true)] [Category("Display")] [WebDisplayName("Popup Text")] [Description("You can configure this text from here in popup")] public string PopupText { get; set; } </code></pre> <p>add above code in WebPart Class and use this "PopupText" property in assign Literal control OR direct render this property in overwrite Render method.</p>