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BOOK: Beginning SharePoint 2010 Development
This is the forum to discuss the Wrox book Beginning SharePoint 2010 Development by Steve Fox; ISBN: 978-0-470-58463-7
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Old October 12th, 2011, 10:15 AM
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Default chapter 2 Create a custom webpart programmatically

using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;

namespace MyFirstWebPart.MyFirstWebPart
    public class MyFirstWebPart : WebPart
        Label lblUserEntry = new Label();
        TextBox txtbxUserEntry = new TextBox();
        Label lblFinalCost = new Label();
        TextBox txtbxFinalCost = new TextBox();
        Button btnCalcTax = new Button();
        double totalTax = 0.00;
        double prodTax = 0.11;
        public MyFirstWebPart()
        { }
        protected override void CreateChildControls()
            lblUserEntry.Text = "Cost of Widget";
            lblFinalCost.Text = "Fianl Cost";
            btnCalcTax.Text = "Calc.";
            txtbxUserEntry.Text = "59.30";
            this.Controls.Add(new LiteralControl("<p>"));
            this.Controls.Add(new LiteralControl("<p>"));
            btnCalcTax.Click+=new EventHandler(btnCalcTax_Click);

        void btnCalcTax_Click(object sender, EventArgs e)
            double prodCost = Convert.ToDouble(txtbxUserEntry.Text);
            txtbxFinalCost.Text = totalTax.ToString();

        protected override void RenderContents(HtmlTextWriter writer)

shows following error when I press F5
cannot start service SPUserCodeV4

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