Update pressed no data saved and reverts back to old data - asp.net

Question

I am having trouble with "Sub GridView1_OnRowUpdating".
When in Edit is pressed, the data in a cell is changed, and the Update is pressed the data reverts back to its original data and no data is stored.
<asp:GridView ID="GridView1" runat="server" AllowSorting="true" AutoPostBack="True" AutoGenerateColumns="True" AutoGenerateEditButton="True" OnRowCancelingEdit="Gridview1_OnRowCancelingEdit" OnRowEditing="Gridview1_OnRowEditing" OnRowUpdating="GridView1_OnRowUpdating"
AllowPaging="True" PageSize="50" OnPageIndexChanging="GridView1_PageIndexChanging">
</asp:GridView>
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
ViewState("pageIndex") = 1
ViewState("edit") = -1
ShowGrid()
End If
End Sub
Sub ShowGrid()
Dim connStr, cmdStr As String
connStr = "connection string works"
cmdStr = "SELECT * FROM OrbitDates;"
Dim ds As New DataSet
Dim dt As New DataTable()
Try
Using conn As New SqlConnection(connStr)
Using cmd As New SqlCommand(cmdStr, conn)
conn.Open()
cmd.ExecuteNonQuery()
Using da As New SqlDataAdapter(cmd)
da.Fill(ds)
dt = ds.Tables(0)
GridView1.EditIndex = Convert.ToInt32(ViewState("edit"))
GridView1.DataSource = dt
GridView1.DataBind()
GridView1.PageIndex = Convert.ToInt32(ViewState("pageIndex"))
End Using
conn.Close()
cmd.Dispose()
conn.Dispose()
End Using
End Using
Catch ex As Exception
End Try
End Sub
Protected Sub GridView1_PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs) Handles GridView1.PageIndexChanging
GridView1.PageIndex = e.NewPageIndex
ViewState("pageIndex") = e.NewPageIndex.ToString()
ShowGrid()
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
ViewState("pageIndex") = 1
ShowGrid()
End Sub
Protected Sub GridView1_OnRowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs) Handles GridView1.RowEditing
GridView1.EditIndex = e.NewEditIndex
ViewState("edit") = GridView1.EditIndex
ShowGrid()
End Sub
Protected Sub GridView1_OnRowCancelingEdit(ByVal sender As Object, ByVal e As GridViewCancelEditEventArgs) Handles GridView1.RowCancelingEdit
GridView1.EditIndex = -1
ViewState("edit") = GridView1.EditIndex
ShowGrid()
End Sub
Protected Sub GridView1_OnRowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs) Handles GridView1.RowUpdating
Dim connStr, cmdStr As String
connStr = "connection string works"
cmdStr = "UPDATE OrbitDates SET JD=#JD,Xecl1=#Xecl1,Yecl1=#Yecl1,Zecl1=#Zecl1 WHERE ido=#ido;"
Try
Using conn As New SqlConnection(connStr)
Using cmd As New SqlCommand(cmdStr, conn)
conn.Open()
cmd.Parameters.AddWithValue("#ido", GridView1.Rows(e.RowIndex).Cells(0).Text)
cmd.Parameters.AddWithValue("#JD", GridView1.Rows(e.RowIndex).Cells(1).Text)
cmd.Parameters.AddWithValue("#Xecl1", GridView1.Rows(e.RowIndex).Cells(2).Text)
cmd.Parameters.AddWithValue("#Yecl1", GridView1.Rows(e.RowIndex).Cells(3).Text)
cmd.Parameters.AddWithValue("#Zecl1", GridView1.Rows(e.RowIndex).Cells(4).Text)
cmd.ExecuteNonQuery()
conn.Close()
cmd.Dispose()
conn.Dispose()
End Using
End Using
Catch ex As Exception
Throw ex
End Try
ViewState("edit") = e.RowIndex
ShowGrid()
End Sub