Error 23 No overload for method 'EndExecuteNonQuery' takes 0 arguments

protected void Page_Load(object sender, EventArgs e)
       {

       }

       protected void btnshowreng_Click(object sender, EventArgs e)
       {

           ConnectionManager cm = new ConnectionManager();
           cm.Command.CommandText = "select * from tblFeedsItems where InsertDate between '" + JQDatePickerstart.Date + "' and '" + JQDatePickerend.Date + "' ";
           cm.Command.CommandType = CommandType.Text;
           cm.Connection.Open();
           SqlDataReader dr=cm.Command.ExecuteReader();
           DataTable dt = new DataTable("dt");
           dt.Load(dr);
           GridView1.DataSource = dt;
           GridView1.DataBind();
           cm.Connection.Close();
       }

       protected void btndelete_Click(object sender, EventArgs e)
       {
           ConnectionManager cm=new ConnectionManager();
           cm.Command.Parameters.Clear();
           cm.Command.CommandText = "Mysp_tblFeedsItems_delete_byDate";
           cm.Command.CommandType = CommandType.StoredProcedure;
           cm.Command.Parameters.Add("@start", SqlDbType.DateTime).Value = JQDatePickerstart.Date;
           cm.Command.Parameters.Add("@end", SqlDbType.DateTime).Value = JQDatePickerend.Date;
           cm.Connection.Open();
           cm.Command.EndExecuteNonQuery();
           cm.Connection.Close();
       }