Sample Code to write a batch using SpWeb Object

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 System.Security;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;
[assembly:AllowPartiallyTrustedCallers]
namespace TestSampleRD
{
[Guid("d8484a38-f485-4eff-8532-7d5e5cf98a45")]
public class TestSampleRD : System.Web.UI.WebControls.WebParts.WebPart
{
TextBox txtUserName;
TextBox txtPassWord;
Button btnSave;
string strError = string.Empty;
public TestSampleRD()
{
}
protected override void Render(HtmlTextWriter writer)
{
try
{
writer.Write("<Table>");
writer.Write("<Tr>");
writer.Write("<Td Colspan='2' Align='Center'>");
writer.Write("Batch and SpWeb Sample...!");
writer.Write("</Td>");
writer.Write("</Tr>");
writer.Write("<Tr>");
writer.Write("<Td>");
writer.Write("Enter UserName");
writer.Write("</Td>");
writer.Write("<Td>");
txtUserName.RenderControl(writer);
writer.Write("</Td>");
writer.Write("</Tr>");
writer.Write("<Tr>");
writer.Write("<Td>");
writer.Write("Enter PassWord");
writer.Write("</Td>");
writer.Write("<Td>");
txtPassWord.RenderControl(writer);
writer.Write("</Td>");
writer.Write("</Tr>");
writer.Write("<Tr>");
writer.Write("<Td Colspan='2' Align='Center'>");
btnSave.RenderControl(writer);
writer.Write("</Td>");
writer.Write("</Tr>");
writer.Write("</Table>");
writer.Write(strError);
}
catch (Exception ex)
{
writer.Write(ex.ToString());
}
}
protected override void CreateChildControls()
{
try
{
txtUserName = new TextBox();
txtUserName.ID = "txtUserName";
this.Controls.Add(txtUserName);
txtPassWord = new TextBox();
txtPassWord.ID = "txtPassWord";
this.Controls.Add(txtPassWord);
btnSave = new Button();
btnSave.ID = "btnSave";
btnSave.Text = "Save Record";
btnSave.Click+=new EventHandler(btnSave_Click);
this.Controls.Add(btnSave);
}
catch (Exception ex)
{
strError += ex.ToString();
}
}
void btnSave_Click(object sender, EventArgs e)
{
try
{
SPSecurity.RunWithElevatedPrivileges(delegate()
{
SPWeb currentWeb = SPControl.GetContextWeb(Context);
using (SPSite site = new SPSite(currentWeb.Url))
{
using (SPWeb objWeb = site.OpenWeb())
{
objWeb.AllowUnsafeUpdates = true;
SPList lst = objWeb.Lists["Login_Dat001"];
System.Guid Guid = lst.ID;
string strBatch = string.Empty;
strBatch += "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
"<ows:Batch OnError=\"Return\">" +
"<Method ID=\"1\"><SetList>" + Guid + "</SetList>" +
"<SetVar Name=\"ID\">New</SetVar>" +
"<SetVar Name=\"Cmd\">Save</SetVar>" +
"<SetVar Name='urn:schemas-microsoft-com:office:office#UserName'>" + txtUserName.Text + "</SetVar><SetVar Name='urn:schemas-microsoft-com:office:office#PassWord'>" + txtPassWord.Text + "</SetVar></Method></ows:Batch>";
string str=objWeb.ProcessBatchData(strBatch);
strError += "Insertion Successful";
txtUserName.Text = "";
txtPassWord.Text = "";
}
}
});
}
catch (Exception ex)
{
strError += ex.ToString();
}
}
}
}