If can prevent user from submitting form without completing both name and address textboxes

Hi ihechi,

You need to remove the Or condition from the If statement.

Dim namespouse As TextBox = TryCast(row.FindControl("txtspname"), TextBox)
Dim nmespouse As String = namespouse.Text
Dim addressspouse As TextBox = TryCast(row.FindControl("txtspaddress"), TextBox)
Dim addrspouse As String = addressspouse.Text
Dim ckb2 As CheckBox = TryCast(row.FindControl("spDetails"), CheckBox)
Dim checkc As Boolean = ckb2.Checked
If Not checkc OrElse (String.IsNullOrEmpty(nmespouse) AndAlso String.IsNullOrEmpty(addrspouse)) Then
    ClientScript.RegisterStartupScript([GetType](), "Confirm", "jAlert('Please enter name and address of spouse or check the checkbox if N/A!');", True)
    Return
End If

Hi Dharmendra,

Thank you as always for your assistance.

Your solution didn't work because I mistakenly left out some important details.

So, the way this works is that user enters data into Name textbox and then enters data into Address textbox.

As soon user does those things, the checkbox is automatically disabled.

If the user does not want to enter data into the Name and Address textboxes, then the user clicks the Checkbox to check the box and checking the box automatically disables the Name and Address textboxes.

Those were the requirements by user and it works very well.

So, the solution you provided (Thank you once again), needs to be modified to check whether the checkbox is enabled or not, whether checkbox is checked or not and whether the Name and Address textboxes are empty or not.

So far, this is my attempt at modifying your code and it is not working:

        For Each row As GridViewRow In grvspouse.Rows
            Dim namespouse As TextBox = TryCast(row.FindControl("txtspname"), TextBox)
            Dim nmespouse As String = namespouse.Text
            Dim addressspouse As TextBox = TryCast(row.FindControl("txtspaddress"), TextBox)
            Dim addrspouse As String = addressspouse.Text
            Dim ckb2 As CheckBox = TryCast(row.FindControl("spDetails"), CheckBox)
            Dim checkc As Boolean = ckb2.Checked
            If (Not checkc AndAlso ckb2.Enabled = False) OrElse (String.IsNullOrEmpty(nmespouse) AndAlso String.IsNullOrEmpty(addrspouse)) Then
                ClientScript.RegisterStartupScript([GetType](), "Confirm", "jAlert('Please enter name and address of spouse or check the checkbox if N/A!');", True)
                Return
            End If
        Next

Each time, I click Submit, I keep getting the alert to please enter name and address...

Hi ihechi,

Refer below sample code.

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:CheckBox ID="chk" runat="server" OnCheckedChanged="OnCheckedChanged" AutoPostBack="true" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="Id" HeaderText="Id" />
        <asp:TemplateField HeaderText="First">
            <ItemTemplate>
                <asp:TextBox ID="txtFirstName" runat="server" AutoPostBack="true" OnTextChanged="OnTextChanged" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Last">
            <ItemTemplate>
                <asp:TextBox ID="txtLastName" runat="server" AutoPostBack="true" OnTextChanged="OnTextChanged" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<br />
<asp:Button Text="Save" runat="server" OnClick="OnSave" />

Code

Imports System.Data

Partial Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
        If Not Me.IsPostBack Then
            Dim dt As New DataTable()
            dt.Columns.AddRange(New DataColumn() {New DataColumn("Id")})
            dt.Rows.Add(1)
            dt.Rows.Add(2)
            dt.Rows.Add(3)
            dt.Rows.Add(4)
            GridView1.DataSource = dt
            GridView1.DataBind()
        End If
    End Sub

    Protected Sub OnCheckedChanged(sender As Object, e As EventArgs)
        Dim chk As CheckBox = TryCast(sender, CheckBox)
        Dim row As GridViewRow = TryCast(chk.NamingContainer, GridViewRow)
        Dim firstName As TextBox = TryCast(row.FindControl("txtFirstName"), TextBox)
        Dim lastName As TextBox = TryCast(row.FindControl("txtLastName"), TextBox)
        firstName.Enabled = True
        lastName.Enabled = True
        If chk.Checked Then
            firstName.Enabled = False
            lastName.Enabled = False
        End If
    End Sub

    Protected Sub OnTextChanged(sender As Object, e As EventArgs)
        Dim txt As TextBox = TryCast(sender, TextBox)
        Dim row As GridViewRow = TryCast(txt.NamingContainer, GridViewRow)
        Dim firstName As TextBox = TryCast(row.FindControl("txtFirstName"), TextBox)
        Dim lastName As TextBox = TryCast(row.FindControl("txtLastName"), TextBox)
        Dim chk As CheckBox = TryCast(row.FindControl("chk"), CheckBox)
        chk.Enabled = True
        If Not String.IsNullOrEmpty(firstName.Text) AndAlso Not String.IsNullOrEmpty(lastName.Text) Then
            chk.Enabled = False
        End If
    End Sub

    Protected Sub OnSave(sender As Object, e As EventArgs)
        For Each row As GridViewRow In GridView1.Rows
            Dim firstName As TextBox = TryCast(row.FindControl("txtFirstName"), TextBox)
            Dim lastName As TextBox = TryCast(row.FindControl("txtLastName"), TextBox)
            Dim chk As CheckBox = TryCast(row.FindControl("chk"), CheckBox)
            If (Not chk.Checked OrElse Not chk.Enabled) AndAlso (String.IsNullOrEmpty(firstName.Text) OrElse String.IsNullOrEmpty(lastName.Text)) Then
                ClientScript.RegisterStartupScript(Me.GetType(), "Confirm", "alert('" & row.RowIndex & ": Please enter First and Last Name or check the checkbox if N/A!');", True)
                Return
            End If
        Next
    End Sub
End Class

Screenshot

Works like a dream.

I wish i had just half your brain sir.

You are too good.

Thank you very much sir.