Problem to use edit, insert in list view

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Branch : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)
{
String queryStringBranch = "SELECT * FROM Branch";
DataSet dsBranch = GetData(queryStringBranch);
if (dsBranch.Tables.Count > 0)
{
DetailsViewBranch.DataSource = dsBranch;
DetailsViewBranch.DataBind();
}
else
{
//Message.Text = "Unable to connect to the database.";
}
}

#region
DataSet GetData(String queryString)
{

// Retrieve the connection string stored in the Web.config file.
String connectionString = "Data Source=nancyintdatabase.db.8547965.hostedresource.com; Initial Catalog=nancyintdatabase; User ID=nancyintdatabase; Password=NANint001;";

DataSet ds = new DataSet();

try
{
// Connect to the database and run the query.
SqlConnection connection = new SqlConnection(connectionString);
SqlDataAdapter adapter = new SqlDataAdapter(queryString, connection);

// Fill the DataSet.
adapter.Fill(ds);
}
catch
{
// The connection failed. Display an error message.
//Message.Text = "Unable to connect to the database.";
}
return ds;
}
#endregion
#region
protected void NextButton_Click(object sender, EventArgs e)
{
Response.Redirect(Request.RawUrl);
}
protected void PreviousButton_Click(object sender, EventArgs e)
{

}
protected void CustomerDetailView_DataBound(object sender, EventArgs e)
{

// Get the pager row.
DetailsViewRow pagerRow = DetailsViewBranch.BottomPagerRow;

// Get the Label controls that display the current page information
// from the pager row.
Label pageNum = (Label)pagerRow.Cells[0].FindControl("PageNumberLabel");
Label totalNum = (Label)pagerRow.Cells[0].FindControl("TotalPagesLabel");

if ((pageNum != null) && (totalNum != null))
{
// Update the Label controls with the current page values.
int page = DetailsViewBranch.DataItemIndex + 1;
int count = DetailsViewBranch.DataItemCount;

pageNum.Text = page.ToString();
totalNum.Text = count.ToString();
}
}
protected void DetailsViewBranch_PageIndexChanging(object sender, DetailsViewPageEventArgs e)
{
}
#endregion
}