Web Part Page Property in SharePoint

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Create Custom SharePoint Web Part Property.
In this example i have created custom page viewer Web Part
1. I have created  a Visual Web Part, and have added the following in this Web Part Pages.

   a) Add the following Code in the WebPart.cs File of the Visual Web Part as Displayed below

[ToolboxItemAttribute(false)]
    public class CustomPageViewerWebPart : WebPart
    {
        // Visual Studio might automatically update this path when you change the Visual Web Part project item.
        private const string _ascxPath = @"~/_CONTROLTEMPLATES/CustomPageViewer/CustomPageViewerWebPart/CustomPageViewerWebPartUserControl.ascx";

        [WebBrowsable(true),
         Category("Miscellaneous"),
         Personalizable(PersonalizationScope.Shared),
         WebDisplayName("Enter URL")]
        public string PageURL { get; set; }

        [WebBrowsable(true),
         Category("Miscellaneous"),
         Personalizable(PersonalizationScope.Shared),
         WebDisplayName("PageHeight")]
        public string PageHeight { get; set; }

        [WebBrowsable(true),
         Category("Miscellaneous"),
         Personalizable(PersonalizationScope.Shared),
         WebDisplayName("PageWidth")]
        public string PageWidth { get; set; }


        protected override void CreateChildControls()
        {
            CustomPageViewerWebPartUserControl control = Page.LoadControl(_ascxPath) as      CustomPageViewerWebPartUserControl;
            Controls.Add(control);

            if (control != null)
                control.CustomPVWebPart = this;
            Controls.Add(control);
        }
    }

  b) Add the Following Design in the User Control Page

<div id="divIframe" visible="false" runat="server">
    <iframe src="http://www.google.com" width="100%" height="100%" runat="server" id="customiframe">
    </iframe>
</div>
<div id="divMessage" visible="true" runat="server">
    <asp:Label ID="lblMessage" runat="server" Text=""> </asp:Label>
</div>

    c) Add the following code in the Code Behind file of the Web Part 

   

    public partial class CustomPageViewerWebPartUserControl : UserControl

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        public CustomPageViewerWebPart CustomPVWebPart { get; set; }

        protected override void OnPreRender(EventArgs e)

        {

            base.OnPreRender(e);

            try

            {

                if (this.CustomPVWebPart != null && this.CustomPVWebPart.PageURL != null

                    && this.CustomPVWebPart.PageHeight != null && this.CustomPVWebPart.PageWidth != null)

                {

                    divIframe.Visible = true;

                    divMessage.Visible = false;

                    customiframe.Attributes.Add("src", this.CustomPVWebPart.PageURL);

                    customiframe.Attributes.Add("width", this.CustomPVWebPart.PageWidth);

                    customiframe.Attributes.Add("height", this.CustomPVWebPart.PageHeight);

                }

                else

                {

                    divIframe.Visible = false;

                    divMessage.Visible = true;

                    lblMessage.Text = "no page is referred";

                }

            }

            catch (Exception ex)

            {

                divIframe.Visible = false;

                divMessage.Visible = true;

                lblMessage.Text = ex.Message;

            }

        }

    }

OutPut

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