Get Hidden Field Value

asp.net, gridview

Solution

The problem is that when the Visibility property of the `BoundField` is set to false the column isn't rendered to the client. A work around would be to use a `HiddenField` within a `TemplateField` instead.

<asp:TemplateField>
    <ItemTemplate>
        <asp:HiddenField ID="HiddenField1" runat="server" 
                         Value='<%# Eval("BirthDate") %>' />
    </ItemTemplate>
    <EditItemTemplate>
        <asp:HiddenField ID="HiddenField1" runat="server" 
                         Value='<%# Eval("BirthDate") %>' />
    </EditItemTemplate>
</asp:TemplateField>

protected void GridView_RowEditing(object sender, GridViewEditEventArgs e)
{
    GridViewRow row = GridView.Rows[e.NewEditIndex];     
    HiddenField  hidden = (HiddenField)row.Cells[0].FindControl("HiddenField1");
    DateTime birthDate = Convert.ToDateTime(hidden.Value);
}

EDIT

The above method still renders the column in the table, so you end up with an empty column. It works but not the best solution, here's a way the hide the BirthDate field but still get its value in the `RowEditing` event handler. Just keep in mind that the BirthDate is still rendered to the client, just not displayed.

<style type="text/css">
    .hide
    {
        display:none;
    }
</style>

<asp:BoundField DataField="BirthDate">
    <ItemStyle CssClass="hide"/>
</asp:BoundField>

protected void GridView_RowEditing(object sender, GridViewEditEventArgs e)
{
    GridViewRow row = GridView1.Rows[e.NewEditIndex];
    DateTime birthDate = Convert.ToDateTime(row.Cells[1].Text);
}

Problem

I have a `GridView` defined as follows: ``` <asp:GridView ID="myGridView" AutoGenerateColumns="false" runat="server" OnLoad="myGridView_Load" OnRowCommand="myGridView_Command" OnRowEditing="myGridView_RowEditing" OnRowDeleting="myGridView_RowDeleting" DataKeyNames="ID" > <Columns> <asp:BoundField DataField="ID" Visible="false" /> <asp:BoundField DataField="BirthDate" Visible="false" /> <asp:BoundField DataField="FirstName" HeaderText="First Name" /> <asp:BoundField DataField="LastName" HeaderText="Last Name" /> <asp:TemplateField HeaderText="Other"> <ItemTemplate> <asp:LinkButton ID="editLB" runat="server" Text="edit" CommandName="Edit" /> <asp:LinkButton ID="deleteLB" runat="server" Text="delete" CommandName="Delete" /> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> ``` When a user clicks the edit button, I need to get the value of the `BirthDate` column. To attempt this, I have tried the following: ``` protected void myGridView_RowEditing(object sender, GridViewEditEventArgs e) { GridViewRow row = gvUsers.Rows[e.NewEditIndex]; DateTime birthDate = (DateTime)(row.Cells[1].Text); // Does not work } ``` I know it has something to do with the fact that the column is not visible. The column must be hidden. But I need to get that value— how can I do this?

Original source