asp.net GridView 삭제 시 팝 업 확인 대화 상자(내용 알림 포함)

<table align="center" bgcolor="#c0de98" border="0" cellpadding="0" cellspacing="1" width="99%"> 
<tr> 
<th colspan="2"> 
GridView  </th> 
</tr> 
<tr> 
<td colspan="2" style="width: 100%;" > 
<asp:GridView ID="GridView" runat="server" Width="100%" AutoGenerateColumns="False" AllowPaging="True" OnPageIndexChanging="GridView_PageIndexChanging" PageSize="12" OnRowDeleting="GridView_RowDeleting" OnRowDataBound="GridView_RowDataBound" > 
<Columns> 
<asp:BoundField DataField="UserID" HeaderText="UserID" ReadOnly="True" /> 
<asp:BoundField DataField="C_Name" HeaderText="    " ReadOnly="True" /> 
<asp:BoundField DataField="E_Name" HeaderText="    " ReadOnly="True" /> 
<asp:BoundField DataField="QQ" HeaderText="QQ  " /> 
<asp:CommandField HeaderText="  " ShowDeleteButton="True" /> 
</Columns> 
<RowStyle HorizontalAlign="Center" /> 
<PagerStyle HorizontalAlign="Right" /> 
</asp:GridView> 
</td> 
</tr> 
</table>       

using System; 
using System.Data; 
using System.Data.SqlClient; 
using System.Configuration; 
using System.Collections; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 

public partial class Demo11 : System.Web.UI.Page 
{ 
protected void Page_Load(object sender, EventArgs e) 
{ 
if (Page.IsPostBack == false) 
{ 
BindData(); 
} 
} 

public void BindData() 
{ 
string strSql = "select UserID,C_Name,E_Name,QQ from Demo_User "; 
DataTable dt = SqlHelper.ExecuteDataset(SqlHelper.CONN_STRING, CommandType.Text, strSql, null).Tables[0]; 

GridView.DataSource = dt; 
GridView.DataKeyNames = new string[] { "UserID" };//   
GridView.DataBind(); 
} 

protected void GridView_PageIndexChanging(object sender, GridViewPageEventArgs e) 
{ 
GridView.PageIndex = e.NewPageIndex; 
BindData(); 
} 

protected void GridView_RowDeleting(object sender, GridViewDeleteEventArgs e) 
{ 
int UserID = (int)GridView.DataKeys[e.RowIndex].Value; 
string strSql = "Delete Demo_User where UserID=@UserID"; 
SqlParameter[] para = { 
new SqlParameter("@UserID", UserID), 
}; 
SqlHelper.ExecuteNonQuery(SqlHelper.CONN_STRING, CommandType.Text, strSql, para); 
BindData(); 
} 

protected void GridView_RowDataBound(object sender, GridViewRowEventArgs e) 
{ 
if (e.Row.RowType == DataControlRowType.DataRow) 
{ 
if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate) 
{ 
((LinkButton)e.Row.Cells[4].Controls[0]).Attributes.Add("onclick", "javascript:return confirm('      ：\"" + e.Row.Cells[1].Text + "\" ?')"); 
} 
} 
} 
}