SQL Command will not work

I cannot figure out why my command will not work. It appears to me that everything is properly formatted. Can someone take a look at it and give suggestions?

<%@ Page Language="VB" MasterPageFile="~/_m/nonavbars.master" AutoEventWireup="false" CodeFile="jz_trucks.aspx.vb" Inherits="_a_jz_trucks" title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="cphMain" Runat="Server">
        <h3>Juarez ICT Truck Shipments</h3>
        <h4>Add a new truck shipment</h4>
        Leave Date:&nbsp;<asp:textbox id="txtLveDate" runat="server" tabindex="1"></asp:textbox>&nbsp;
        <asp:imagebutton id="ibtnLveDate" runat="server" imageurl="~/_i/calendar.png" tabindex="2" />
        <asp:requiredfieldvalidator id="reqLveDate" runat="server" controltovalidate="txtLveDate"
            errormessage="*"></asp:requiredfieldvalidator><br />
        Arrive Date:&nbsp;<asp:textbox id="txtArvDate" runat="server" tabindex="3"></asp:textbox>&nbsp;
        <asp:imagebutton id="ibtnArvDate" runat="server" imageurl="~/_i/calendar.png" tabindex="4" />
        <asp:requiredfieldvalidator id="reqArvDate" runat="server" controltovalidate="txtArvDate"
            display="Dynamic" errormessage="*"></asp:requiredfieldvalidator><br />
        Initials:&nbsp;<asp:textbox id="txtInitials" runat="server" maxlength="3" tabindex="5"></asp:textbox>&nbsp;
        <asp:requiredfieldvalidator id="reqInitials" runat="server" controltovalidate="txtInitials"
            display="Dynamic" errormessage="*"></asp:requiredfieldvalidator><br />
        <asp:linkbutton id="lbtnJzTrkSubmit" runat="server" tabindex="6">Submit</asp:linkbutton>&nbsp;
        <asp:linkbutton id="lbtnJzTrkReset" runat="server" tabindex="7" causesvalidation="False">Reset</asp:linkbutton>&nbsp;
    <asp:label id="lblTruckSubmitted" runat="server" forecolor="#00C000" text="Truck shipment successfully submitted."
        visible="False"></asp:label><h4>Future Shipments</h4>
    <asp:gridview id="GridView1" runat="server" autogeneratecolumns="False" cellpadding="4" datasourceid="srcJzTrucks" emptydatatext="There are current no shipments scheduled." forecolor="#333333" gridlines="None">
        <footerstyle backcolor="#990000" font-bold="True" forecolor="White" />
        <rowstyle backcolor="#FFFBD6" forecolor="#333333" />
        <columns>
            <asp:boundfield datafield="leave_date" dataformatstring="(0:d}" headertext="Leaving"
                htmlencode="False" sortexpression="leave_date" />
            <asp:boundfield datafield="arrive_date" dataformatstring="(0:d}" headertext="Arriving"
                htmlencode="False" sortexpression="arrive_date" />
            <asp:boundfield datafield="initials" headertext="Submitted By" sortexpression="initials" />
            <asp:boundfield datafield="submit_date" dataformatstring="(0:d}" headertext="Submitted"
                htmlencodeformatstring="False" sortexpression="submit_date" />
        </columns>
        <pagerstyle backcolor="#FFCC66" forecolor="#333333" horizontalalign="Center" />
        <selectedrowstyle backcolor="#FFCC66" font-bold="True" forecolor="Navy" />
        <headerstyle backcolor="#990000" font-bold="True" forecolor="White" />
        <alternatingrowstyle backcolor="White" />
    </asp:gridview>
    <asp:sqldatasource id="srcJzTrucks" runat="server" connectionstring="<%$ ConnectionStrings:conIntranet %>"
        selectcommand="SELECT leave_date, arrive_date, initials, submit_date FROM jz_truck WHERE (arrive_date > { fn NOW() }) ORDER BY leave_date, arrive_date">
    </asp:sqldatasource>
        <ajaxtoolkit:calendarextender id="calxLveDate" runat="server" popupbuttonid="ibtnLveDate" targetcontrolid="txtLveDate">
        </ajaxtoolkit:calendarextender>
        <ajaxtoolkit:calendarextender id="calxArvDate" runat="server" popupbuttonid="ibtnArvDate" targetcontrolid="txtArvDate">
        </ajaxtoolkit:calendarextender>
        <ajaxtoolkit:textboxwatermarkextender id="wtrLveDate" runat="server" targetcontrolid="txtLveDate" watermarktext="Enter leave date.">
        </ajaxtoolkit:textboxwatermarkextender><ajaxtoolkit:textboxwatermarkextender id="wtrArvDate" runat="server"  watermarktext="Enter arrive date."
            targetcontrolid="txtArvDate">
        </ajaxtoolkit:textboxwatermarkextender>
        <ajaxtoolkit:textboxwatermarkextender id="wtrInitials" runat="server"  watermarktext="Enter initials."
            targetcontrolid="txtInitials">
        </ajaxtoolkit:textboxwatermarkextender>
        <ajaxtoolkit:maskededitextender id="meeLveDate" masktype="Date" mask="99/99/9999" runat="server" targetcontrolid="txtLveDate">
        </ajaxtoolkit:maskededitextender>
        <ajaxtoolkit:maskededitextender id="meeArvDate" masktype="Date" mask="99/99/9999" runat="server" targetcontrolid="txtArvDate">
        </ajaxtoolkit:maskededitextender>
</asp:Content>
 
 
Imports System.IO
Imports System.DateTime
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.Configuration
 
Partial Class _a_jz_trucks
    Inherits System.Web.UI.Page
 
    Protected Sub lbtnJzTrkReset_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lbtnJzTrkReset.Click
        Me.txtArvDate.Text = ""
        Me.txtInitials.Text = ""
        Me.txtLveDate.Text = ""
        Me.lblTruckSubmitted.Visible = False
    End Sub
 
    Protected Sub lbtnJzTrkSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lbtnJzTrkSubmit.Click
        Dim dteLve As Date = Me.txtLveDate.Text
        Dim dteArv As Date = Me.txtArvDate.Text
        Dim dteSub As Date = Today.ToString()
        Dim strInitials As String = Me.txtInitials.Text
        Dim connectionString As String = WebConfigurationManager.ConnectionStrings("conIntranet").ConnectionString
        Dim con As New SqlConnection(connectionString)
        Dim cmdJzTruckInsert As New SqlCommand("INSERT jz_truck (leave_date, arrive_date, submit_date, initials) values (@LveDate, @ArvDate, @SubDate, @Initials)", con)
        cmdJzTruckInsert.Parameters.Add("@LveDate", SqlDbType.Date).Value = dteLve
        cmdJzTruckInsert.Parameters.Add("@ArvDate", SqlDbType.Date).Value = dteArv
        cmdJzTruckInsert.Parameters.Add("@SubDate", SqlDbType.Date).Value = dteSub
        cmdJzTruckInsert.Parameters.Add("@Initials", SqlDbType.NVarChar, 50).Value = strInitials
        Try
            con.Open()
            cmdJzTruckInsert.ExecuteNonQuery()
        Catch ex As Exception
        Finally
 
            con.Close()
        End Try
        Me.lblTruckSubmitted.Visible = True
    End Sub
End Class

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