Use if statement to check form input data (VB.net) : TextBox « ASP.net Controls « ASP.NET Tutorial






  1. ASP.NET Tutorial
  2. ASP.net Controls
  3. TextBox
<script runat="server">
   sub Submit(Sender as Object, e as EventArgs)
      if tbFName.Text <> "" and not IsNumeric(tbFName.Text) then
         lblMessage.Text = "First name is incorrect!"
      end if
      if tbLName.Text <> "" and not IsNumeric(tbLName.Text) then
         lblMessage.Text = "Last name is incorrect!"
      end if

      if tbAddress.Text <> "" then
         lblMessage.Text = "Address is incorrect!"
      end if
 
      if tbCity.Text <> "" and not IsNumeric(tbCity.Text) then
         lblMessage.Text = "City is incorrect!"
      end if
 
      if tbState.Text <> "" and not IsNumeric(tbState.Text) then
        lblMessage.Text = "State is incorrect!"
      end if
  
      if tbZIP.Text <> "" and IsNumeric(tbZIP.Text) then
        lblMessage.Text = "ZIP is incorrect!"
      end if
  
      if tbPhone.Text <> "" then
        lblMessage.Text = "Success!"
      else
        lblMessage.Text = "Phone is incorrect!"
      end if
   end sub
</script>

<html><body>
   <form runat="server">
      <asp:Label id="lblMessage" runat="server" /><br>
      <asp:Panel id="Panel1" runat="server">
               First and last name:
               <asp:TextBox id="tbFName" runat="server" />
               <asp:TextBox id="tbLName" runat="server" />
               Email:
               <asp:TextBox id="tbEmail" 
                  runat="server" />
               Address:
               <asp:TextBox id="tbAddress" 
                  runat="server" />
               City, State, ZIP:
               <asp:TextBox id="tbCity" 
                  runat="server" />,
               <asp:TextBox id="tbState" runat="server"
                  size=2 />&nbsp;
               <asp:TextBox id="tbZIP" runat="server"
                  size=5 />
               Phone:
               <asp:TextBox id="tbPhone" runat="server"
                  size=11 />
               <asp:Button id="btSubmit" runat="server" 
                  text="Add" OnClick="Submit"/>
      </asp:Panel>
   </form>
</body></html>








3.5.TextBox
3.5.1.Important properties, method and event of TextBox control
3.5.2.TextBox can display different types of input fields depending TextMode property
3.5.3.Show AutoComplete
3.5.4.Set the focus to a TextBox
3.5.5.Get input value from asp:textbox (VB.net)
3.5.6.Set textbox text value in button action
3.5.7.asp:TextBox changed event (C#)
3.5.8.Use if statement to check form input data (VB.net)
3.5.9.Bind string value to asp:textBox (VB.net)
3.5.10.Use Cint to convert input value in asp:textbox to integer (VB)
3.5.11.Use Convert.ToInt32 to convert input value in asp:textbox to integer (C#)
3.5.12.Check form input value and report error in case of empty input (VB.net)
3.5.13.Set AutoCompleteType
3.5.14.Convert input in TextBox into decimal
3.5.15.Extrapolate date values from the typed text