How to insert date time picker with in repeater control?

Hi Friends,

i wanna create an application staff in time out time calculation,
so i show the staff_id,staff_name in repeater which has already stored in database,ve to insert only datetime with in the repeater so i made code for repeater.

in asp.net:
------------

ID	Customer	Date

My C# Code:
----------


SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["AccessConnectionString"].ConnectionString);

protected void Page_Load(object sender, EventArgs e)
{
BindGrid();
}



private void BindGrid()
{


SqlDataAdapter sqlAdp = new SqlDataAdapter("Select cust_Id,Cus_name,dateF from datet ", conn);
DataTable dt = new DataTable();
sqlAdp.Fill(dt);
Rep.DataSource = dt;
Rep.DataBind();

}


protected void Button1_Click(object sender, EventArgs e)
{
string query = "";
conn.Open();
foreach (RepeaterItem item in Rep.Items)
{
TextBox cust_id = (TextBox)item.FindControl("cust_id");
TextBox Cus_name = (TextBox)item.FindControl("Cus_name");
TextBox datetimepicker = (TextBox)item.FindControl("dateF");


query = "insert into datet values(cust_id='" + @cust_id + "',Cus_name='" + @Cus_name + "',dateF='" + datetimepicker.Text + "')";

SqlCommand cmd = new SqlCommand(query, conn);
cmd.ExecuteNonQuery();
}
}

here my problem is when i use the datetime picker outside of the repeater control its showing calender and time , inside the repeater it was not working?????
how to solve?