SharePoint Web Part Help

Please see below code below.

I am trying to create a webpart that allows a person to create sub-sites using a existing site template that's provided in a drop down list.

I get the following error when I run the code:

Error      2      The event 'System.Web.UI.WebControls.Button.Click' can only appear on the left hand side of += or -=      line 90

Error      3      The best overloaded method match for 'Microsoft.SharePoint.SPWebCollection.Add(string, string, string, uint, string, bool, bool)' has some invalid arguments         line 111

Error      4      Argument '1': cannot convert from 'System.Web.UI.WebControls.TextBox' to 'string'    line 111

Error      5      Argument '2': cannot convert from 'System.Web.UI.WebControls.TextBox' to 'string'    line 111

Error      6      Argument '3': cannot convert from 'System.Web.UI.WebControls.TextBox' to 'string'   line 111

using System;
using System.Runtime.InteropServices;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Serialization;

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;

namespace CreateSolutionSiteWebPart
{
    [Guid("0b2ced02-2687-4c50-9b57-f9b2ea5f31cc")]
    public class CreateSolutionSiteWebPart : System.Web.UI.WebControls.WebParts.WebPart
    {
        // declare all your controls here so they don't pass out of scope
        Label lbl_siteName = null;
        Label lbl_siteDesc = null;
        Label lbl_siteUrl = null;
        Label lbl_drpDwnList = null;
        TextBox txt_siteName = null;
        TextBox txt_siteDesc = null;
        TextBox txt_siteUrl = null;
        DropDownList drp_siteTempLates = null;
        Button btn_Submit = null;
        Label lbl_uPermissions = null;
        CheckBox txt_uPermissions = null;

        public CreateSolutionSiteWebPart()
        {
        }

        // configure and populate all your controls here
        protected override void CreateChildControls()
        {
            base.CreateChildControls();

            // TODO: add custom rendering code here.
            // Label label = new Label();
            // label.Text = "Hello World";
            // this.Controls.Add(label);
            lbl_siteName = new Label();
            lbl_siteDesc = new Label();
            lbl_siteUrl = new Label();
            lbl_drpDwnList = new Label();

            txt_siteName = new TextBox();
            txt_siteDesc = new TextBox();
            txt_siteUrl = new TextBox();
            drp_siteTempLates = new DropDownList();

            lbl_siteName.Text = "Name: ";
            Controls.Add(lbl_siteName);

            txt_siteName.Width = new Unit(295, UnitType.Pixel);
            Controls.Add(txt_siteName);

            lbl_siteDesc.Text = "Description: ";
            Controls.Add(lbl_siteDesc);

            txt_siteDesc.Width = new Unit(295, UnitType.Pixel);
            Controls.Add(txt_siteDesc);

            lbl_siteUrl.Text = "Url: ";
            Controls.Add(lbl_siteUrl);

            txt_siteUrl.Width = new Unit(295, UnitType.Pixel);
            Controls.Add(txt_siteUrl);

            lbl_drpDwnList.Text = "Make a Selection";
            Controls.Add(lbl_drpDwnList);

            SPSite site;
            SPWebTemplateCollection coll;
            site = SPContext.Current.Site;
            coll = site.GetWebTemplates(SPContext.Current.RegionalSettings.LocaleId);
            for (int i = 0; i < coll.Count; i++)
            {
                ListItem li = new ListItem();
                li.Text = coll[i].Title;
                li.Value = coll[i].Name;
                drp_siteTempLates.Items.Add(li);
            }


            btn_Submit = new Button();
            btn_Submit.Width = new Unit(50, UnitType.Pixel);
            btn_Submit.Text = "Submit";
            btn_Submit.Click += new EventHandler(btn_Submit.Click);  <- Line 90
            Controls.Add(btn_Submit);

        }

        void OnLoad(object sender, EventArgs e)
        {
            EnsureChildControls();
        }

        void btn_Submit_Click(object sender, EventArgs e)
        {
            Guid siteID = SPContext.Current.Site.ID;
            Guid webSiteID = SPContext.Current.Web.ID;

            SPSecurity.RunWithElevatedPrivileges(delegate
            {
                using (SPSite site = new SPSite(siteID))
                {
                    SPWeb myWeb = site.OpenWeb();
                    SPWebCollection mySite = myWeb.Webs;
                    SPWeb newSite = mySite.Add(txt_siteUrl, txt_siteName, txt_siteDesc, 1033, "STS#1", true, false);  <-- Line 111
                }

            });
        }
        // remember to have functions to populate the dropdown
        // and create the site

        // you can use this function to get the values of controls 
        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);

        }

        // use this function to layout your controls
        protected void Render(HtmlTextWriter writer)
        {
            // lbltest.RenderControl(writer);   put down the control
            // writer.Write(@""&nbsp;");        add a space at the end
            writer.Write(@"<Table width='35%' align='center'><tr><td>");
            lbl_siteName.RenderControl(writer);
            writer.Write(@"</td><td>");
            txt_siteName.RenderControl(writer);
            writer.Write(@"</td></tr><tr><td>");
            lbl_siteDesc.RenderControl(writer);
            writer.Write(@"</td><td>");
            txt_siteDesc.RenderControl(writer);
            writer.Write(@"</td></tr><tr><td>");
            lbl_siteUrl.RenderControl(writer);
            writer.Write(@"</td><td>");
            txt_siteUrl.RenderControl(writer);
            writer.Write(@"</td></tr><tr><td colspan='2'>");
            btn_Submit.RenderControl(writer);
            writer.Write(@"</td></tr></table>");
        }
    }
}

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