I have an input form that submits user data to a DB table using a stored procedure only after the ASP.NET validations have been met. Once the page is valid, the form disappears to the user, and they instead see a confirmation message.
It works great, except for if I then push the refresh button on that same page. If I do that, the stored procedure is run again, and the data is re-submitted to the DB table.
I know that I'm missing a simple step in this, but I'm not sure how to proceed. I've included all of the related code below. Any and all help would be appreciated.
feedback.aspx.vb:
Code:
Imports System.Data.SqlClient
Partial Class forms_feedback
Inherits System.Web.UI.Page
Private ds As New DataSet()
Private conn As SqlConnection
Private cmd As New SqlCommand()
Sub SubmitBtn_Click(ByVal Sender As Object, ByVal E As EventArgs)
'Declare form variables
Dim category_form As String = selectCategory.SelectedItem.Value
Dim address_form As String = txtAddress.Text
Dim fullname_form As String = txtFullName.Text
Dim city_form As String = txtCity.Text
Dim state_form As String = selectState.SelectedItem.Value
Dim zipcode_form As String = txtZipCode.Text
Dim email_form As String = txtEmailAddress.Text
Dim phone_form As String = txtPhone.Text
Dim comments_form As String = txtComments.Text
'Assign date variables
Dim dtCurrDate As DateTime = DateTime.Now 'Assign current date
Dim strDateTimeISO As String = dtCurrDate.ToString("s") 'ISO format
hfDateTime.Value = strDateTimeISO
Session("SubmitTime") = dtCurrDate.ToString("t")
'Assign server variables
hfRemoteAddr.Value = Request.ServerVariables("REMOTE_ADDR")
hfRemoteHost.Value = Request.ServerVariables("REMOTE_HOST")
If Page.IsValid Then
'Display confirmation message
lblOutput.Text = "Thank you for completing the Feedback Form. If contact was requested, you should be contacted by someone within 1-3 days during normal business hours."
'Insert into database
conn = New SqlConnection("server=SERVERNAME;database=DBNAME;uid=USERNAME;pwd=PASSWORD")
cmd = New SqlCommand("spFeedback", conn)
cmd.CommandType = CommandType.StoredProcedure
'Assign form paramaters
cmd.Parameters.Add("@category_id", SqlDbType.VarChar, 16).Value = category_form
cmd.Parameters.Add("@fullname", SqlDbType.VarChar, 50).Value = fullname_form
cmd.Parameters.Add("@address", SqlDbType.VarChar, 50).Value = address_form
cmd.Parameters.Add("@city", SqlDbType.VarChar, 50).Value = city_form
cmd.Parameters.Add("@state", SqlDbType.VarChar, 2).Value = state_form
cmd.Parameters.Add("@zipcode", SqlDbType.VarChar, 10).Value = zipcode_form
cmd.Parameters.Add("@email", SqlDbType.VarChar, 75).Value = email_form
cmd.Parameters.Add("@phone", SqlDbType.VarChar, 20).Value = phone_form
cmd.Parameters.Add("@comments", SqlDbType.VarChar, 1000).Value = comments_form
cmd.Parameters.Add("@remoteaddr", SqlDbType.VarChar, 20).Value = hfRemoteAddr.Value
cmd.Parameters.Add("@remotehost", SqlDbType.VarChar, 20).Value = hfRemoteHost.Value
cmd.Parameters.Add("@datetime", SqlDbType.VarChar, 50).Value = hfDateTime.Value
conn.Open()
cmd.ExecuteNonQuery()
conn.Close()
End If
End Sub
End Class
feedback.aspx:
Code:
<%@ Page Language="VB" MasterPageFile="~/MasterPage.master" CodeFile="feedback.aspx.vb" Inherits="forms_feedback" AutoEventWireup="true" title="Feedback Form" %>
<asp:content id="Content1" contentplaceholderid="ContentPlaceHolder1" runat="server">
<asp:label id="lblOutput" runat="server" /><br />
<% If Not Page.IsPostBack Then %>
<form name="formFeedback" action="" method="post" runat="server">
<asp:ValidationSummary ID="valSummary" runat="server"
HeaderText="You must fix the following form entries:"
Font-Names="verdana"
Font-Size="10pt"
Font-Bold="True"
/>
<br />
<table class="tableborder_black" width="98%" id="Feedback Form">
<tbody>
<tr class="tablecell_black">
<th scope="col" colspan="2">Feedback Form</th>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top">Category</td>
<td class="tablecell3">
<asp:DropDownList id="selectCategory" runat="server">
<asp:ListItem Value="general" Text="General" Selected="True" />
<asp:ListItem Value="cat1" Text="Category 1" />
<asp:ListItem Value="cat2" Text="Category 2" />
<asp:ListItem Value="cat3" Text="Category 3" />
</asp:DropDownList>
</td>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top" style="height: 26px">Full Name</td>
<td class="tablecell3" style="height: 26px">
<asp:Textbox id="txtFullName" columns="20" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ErrorMessage="Allowed characters: A-Z, a-z, and dashes (-)." ValidationExpression="^[a-zA-Z-]{0,50}$" ControlToValidate="txtFullName"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top">Address</td>
<td class="tablecell3"><asp:Textbox id="txtAddress" columns="20" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtAddress"
ErrorMessage="Allowed characters: 0-9, A-Z, a-z, dashes (-), periods (.), and number signs (#)." ValidationExpression="^[a-zA-Z0-9 \.#-/]{0,50}$"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top">City</td>
<td class="tablecell3"><asp:Textbox id="txtCity" columns="20" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator3" runat="server" ControlToValidate="txtCity"
ErrorMessage="Allowed characters: A-Z, a-z, dashes (-), and periods (.)." ValidationExpression="^[a-zA-Z \.-]{0,50}$"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top">State</td>
<td class="tablecell3">
<!--<asp:DropDownList id="stateoption" runat="server" />
<br />-->
<asp:DropDownList id="selectState" runat="server">
<asp:ListItem Value="" Text="- Select -" Selected="true" />
<asp:ListItem Value="AK" Text="Arkansas" />
<asp:ListItem Value="AL" Text="Alabama" />
<asp:ListItem Value="AR" Text="Arkansas" />
<asp:ListItem Value="AZ" Text="Arizona" />
<asp:ListItem Value="CA" Text="California" />
<asp:ListItem Value="CO" Text="Colorado" />
<asp:ListItem Value="CT" Text="Connecticut" />
<asp:ListItem Value="DE" Text="Deleware" />
<asp:ListItem Value="FL" Text="Florida" />
<asp:ListItem Value="GA" Text="Georgia" />
<asp:ListItem Value="HI" Text="Hawaii" />
<asp:ListItem Value="IA" Text="Iowa" />
<asp:ListItem Value="ID" Text="Idaho" />
<asp:ListItem Value="IL" Text="Illinois" />
<asp:ListItem Value="IN" Text="Indiana" />
<asp:ListItem Value="KS" Text="Kansas" />
<asp:ListItem Value="KY" Text="Kentucky" />
<asp:ListItem Value="LA" Text="Louisiana" />
<asp:ListItem Value="MA" Text="Massachusetts" />
<asp:ListItem Value="MD" Text="Maryland" />
<asp:ListItem Value="ME" Text="Maine" />
<asp:ListItem Value="MI" Text="Michigan" />
<asp:ListItem Value="MN" Text="Minnesota" />
<asp:ListItem Value="MO" Text="Missouri" />
<asp:ListItem Value="MS" Text="Mississippi" />
<asp:ListItem Value="MT" Text="Montana" />
<asp:ListItem Value="NC" Text="North Carolina" />
<asp:ListItem Value="ND" Text="North Dakota" />
<asp:ListItem Value="NE" Text="Nebraska" />
<asp:ListItem Value="NH" Text="New Hampshire" />
<asp:ListItem Value="NJ" Text="New Jersey" />
<asp:ListItem Value="NM" Text="New Mexico" />
<asp:ListItem Value="NV" Text="Nevada" />
<asp:ListItem Value="NY" Text="New York" />
<asp:ListItem Value="OH" Text="Ohio" />
<asp:ListItem Value="OK" Text="Oklahoma" />
<asp:ListItem Value="OR" Text="Oregon" />
<asp:ListItem Value="PA" Text="Pennsylvania" />
<asp:ListItem Value="RI" Text="Rhode Island" />
<asp:ListItem Value="SC" Text="South Carolina" />
<asp:ListItem Value="SD" Text="South Dakota" />
<asp:ListItem Value="TN" Text="Tennessee" />
<asp:ListItem Value="TX" Text="Texas" />
<asp:ListItem Value="UT" Text="Utah" />
<asp:ListItem Value="VA" Text="Virginia" />
<asp:ListItem Value="VT" Text="Vermont" />
<asp:ListItem Value="WA" Text="Washington" />
<asp:ListItem Value="DC" Text="Washington D.C." />
<asp:ListItem Value="WI" Text="Wisconsin" />
<asp:ListItem Value="WV" Text="West Virginia" />
<asp:ListItem Value="WY" Text="Wyoming" />
<asp:ListItem Value="OT" Text="Other (specify in comments)" />
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" ControlToValidate="selectState" runat="server"
ErrorMessage="Must select a state."></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top" style="height: 26px">Zip Code</td>
<td class="tablecell3" style="height: 26px"><asp:Textbox id="txtZipCode" columns="20" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator4" runat="server" ControlToValidate="txtZipCode"
ErrorMessage="Zip code must be valid (Format: xxxxx or xxxxx-xxxx)." ValidationExpression="\d{5}(-\d{4})?"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top">Email Address</td>
<td class="tablecell3"><asp:Textbox id="txtEmailAddress" columns="20" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator5" runat="server" ControlToValidate="txtEmailAddress"
ErrorMessage="Email must be valid (Format: you@domain.com)." ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top">Phone</td>
<td class="tablecell3"><asp:Textbox id="txtPhone" columns="20" runat="server" />
<asp:RegularExpressionValidator ID="RegularExpressionValidator7" runat="server" ControlToValidate="txtPhone"
ErrorMessage="Phone number must be valid (Format: xxx-xxx-xxxx)." ValidationExpression="((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}"></asp:RegularExpressionValidator>
</td>
</tr>
<tr>
<td class="tablecell1" align="right" valign="top" style="height: 50px">Comments</td>
<td class="tablecell3" style="height: 50px">
<asp:TextBox ID="txtComments" Columns="40" Rows="4" runat="server" Height="60px" TextMode="MultiLine"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtComments"
ErrorMessage="Must enter comments to complete this form." Display="Dynamic"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator8" runat="server" ControlToValidate="txtComments"
ErrorMessage="Must enter between 5 and 1000 characters." ValidationExpression="^[a-zA-Z-0-9]{5,1000}$" Display="Dynamic"></asp:RegularExpressionValidator>
</td>
</tr>
<tr class="tablecell_black">
<td scope="col" colspan="2" align="center">
<asp:HiddenField ID="hfRemoteAddr" runat="server" />
<asp:HiddenField ID="hfRemoteHost" runat="server" />
<asp:HiddenField ID="hfDateTime" runat="server" />
<input id="btnReset" type="Reset" runat="server">
<asp:Button ID="btnSubmit" Text="Submit" OnClick="SubmitBtn_Click" runat="server" />
</td>
</tr>
</tbody>
</table>
</form>
<% End If %>
</asp:content>
KWilliams
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