how to validate dropdownlist, when i retrived from database

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how to validate drowndownlist, when i retived data from databse.

for example dropdownlist name is City.if user does not select a city mean
then i want display msg like("slect a city) in alter box

Posted 25-Jul-11 3:20am

csaravanan28

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DominicZA · Answer 1 · 2011-07-25T03:26:00

After binding your DropDownList insert a please select item:

myDDL.Items.Insert(0, new ListItem("Please Select A City", "0"));

Then, on your save button's click event you just check your DropDownLists selected value:

if (myDDL.SelectedValue == "0")
{
    myErrorLabel.Text = "Please Select a City";
    return;
}

//Save info to database here

**R. Giskard Reventlov** · Answer 2 · 2011-07-25T03:30:00

Try something like this:

<asp:requiredfieldvalidator id="rfvCity" runat="server" controltovalidate="ddlCity" display="Dynamic" enableclientscript="true" errormessage="Please Select a City" forecolor="Red" initialvalue="Select a City..." xmlns:asp="#unknown">*&nbsp;</asp:requiredfieldvalidator>

You'll need to add <asp:validationsummary id="valSummary" runat="server" forecolor="Red" xmlns:asp="#unknown" /> somewhere on the page to display the error message.

mahabubur rahman · Answer 3 · 2011-07-25T18:35:00

3 way to validate this problem

1. Using Server Side code (C#, VB)

if(dropdownList1.SelectedValue=="")
{
   lblMessage.Text="Please Select Your City.";
   return;
}

2. Using RequiredFieldValidator

XML

<asp:DropDownList ID="DropDownList1" runat="server">
    <asp:ListItem></asp:ListItem>
    <asp:ListItem Value="Male"></asp:ListItem>
    <asp:ListItem>Female</asp:ListItem>
</asp:DropDownList>


<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
    ErrorMessage="Please Select City" ControlToValidate="DropDownList1"
    ForeColor="Red"></asp:RequiredFieldValidator>

3. Using JavaScript

XML

<script type="text/javascript">
    function CheckDropDownList() {
        if (document.getElementById('DropDownList1').selectedIndex = "0")
            alert('Please Select City');
    }
</script>

<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="CheckDropDownList()" />

learn about validation control please visit
http://msdn.microsoft.com/en-us/library/aa479013.aspx[^]

Thanks

Mohd Wasif · Answer 4 · 2011-07-25T18:49:00

C#

void BindCity()
 {
     dt = City.SelectCity();
     ddlCity.DataSource=dt;
     ddlCity.DataTextField="CityName";
     ddlCity.DataValueField = "CityId";
     ddlCity.DataBind();
     ddlCity.Items.Insert(0, "Select");
 }

call this on page load event and take a required field Validater

XML

<asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server"
                 ControlToValidate="ddlCity" ErrorMessage="*" InitialValue="Select"></asp:RequiredFieldValidator>

how to validate dropdownlist, when i retrived from database

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