listview displays data twice

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This is my code to load data into my listview. When i add new data in my database and refresh my listview, the new data get displayed but the previous data also get listed again(duplicated). How can i make my listview display all records only once?

VB

Private Sub populate_studentLvw()
       con.Open()
       cmd = New SqlCommand("select * FROM Students", con)
       Using dr As SqlDataReader = cmd.ExecuteReader
           While dr.Read
               Dim li As New ListViewItem()
               li.Text = Convert.ToString(dr.Item("student_pk"))
               li.SubItems.Add(Convert.ToString(dr.Item("student_fullname")))
               li.SubItems.Add(Convert.ToString(dr.Item("student_branch")))
               li.SubItems.Add(Convert.ToString(dr.Item("student_scholarship")))
               studentLvw.Items.Add(li)
           End While
       End Using
       cmd.Dispose()
       con.Close()

My datagrid does not have this problem.Please give suggestions. Thanks.

Posted 9-Dec-14 20:22pm

hlsc1983

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2 solutions

Solution 1

clear the listitems using "li.items.clear()" everytime when you are calling above function or may be write this function inside (!ispostback) so that will bind data once only.

Posted 9-Dec-14 20:31pm

ravikhoda

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DamithSL · Accepted Answer · 2014-12-09T20:38:00

VB

Private Sub populate_studentLvw()
       studentLvw.Items.clear()' clear the items first
       con.Open()
       cmd = New SqlCommand("select * FROM Students", con)
       Using dr As SqlDataReader = cmd.ExecuteReader
           While dr.Read
               Dim li As New ListViewItem()
               li.Text = Convert.ToString(dr.Item("student_pk"))
               li.SubItems.Add(Convert.ToString(dr.Item("student_fullname")))
               li.SubItems.Add(Convert.ToString(dr.Item("student_branch")))
               li.SubItems.Add(Convert.ToString(dr.Item("student_scholarship")))
               studentLvw.Items.Add(li)
           End While
       End Using
       cmd.Dispose()
       con.Close()