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My panel fails to show if the user clicks a specific drop down list item

I am attempting to get a <div> to appear when a specific ListItem is selected.
In my code behind I have:
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if (reportedBefore.SelectedItem.Text=="yes")
{
reportedBeforePanel.Visible = true;
}
else
{
reportedBeforePanel.Visible = false;
}
}
I referred to this article here initially, which stated I needed a few things:
You need to Enable the AutoPostBack of the dropdownlist for raising the OnSelectedIndexChanged event on server side.
AutoPostBack="true"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged
Admittedly, I did not have an AutoPostBack before. After adding it, I am afraid for some reason the requested div still does not show.
<asp:DropDownList ID="reportedBefore" CssClass="larger-drop-2" AutoPostBack="true" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem Text="Select" Value="Select"></asp:ListItem>
<asp:ListItem Text="No" Value="No"></asp:ListItem>
<asp:ListItem Text="Yes" Value="Yes"></asp:ListItem>
<asp:ListItem Text="Unsure" Value="Unsure"></asp:ListItem>
</asp:DropDownList>
<asp:Panel ID="reportedBeforePanel" runat="server" Visible="false">
<div id="showDiv">
<label for="yesDetails">
Please provide details
</label>
<asp:TextBox ID="yesDetails" CssClass="third-w-form" runat="server"/>
</div>
</asp:Panel>
Would someone be so kind to help me out here?

The problem is in the following if-condition:
reportedBefore.SelectedItem.Text=="yes"
By this, you are doing a case-sensitive string comparison (this is the default in .NET), but the values in your dropdownlist are written in a different way ("Yes" vs. "yes").
In order to fix this, either perform a case-insensitive string comparison
string.Compare(reportedBefore.SelectedItem.Text, "yes", true) == 0
or change the casing in the if-statement.

C# is case sensitive, so it's "Yes" not "yes":
reportedBeforePanel.Visible = reportedBefore.SelectedItem.Text == "Yes";
Alternatievely you can use this:
reportedBeforePanel.Visible = reportedBefore.SelectedItem.Text.Equals("yes", StringComparison.InvariantCultureIgnoreCase);

asp:label change visibility after hiding it

I've got an asp:Label and a asp:DropDownList that I want to be able to switch back and forth between visible and invisible when clicking on some buttons. Right now, my code looks like
aspx file
<asp:Label AssociatedControlID="statusFilter" id="statusFilterLabel" runat="server" CssClass="filterLabel">Status
<asp:DropDownList ID="statusFilter" runat="server" CssClass="filterInput" AutoPostBack="true" OnSelectedIndexChanged="anyFilter_SelectedIndexChanged" AppendDataBoundItems="True">
<asp:ListItem Selected="True" Value=" 0"><All></asp:ListItem>
</asp:DropDownList>
</asp:Label>
<asp:Button Text="ALL" ID="AllTabButton" CssClass="tabButton" runat="server" OnClick="AllTab_Click" />
<asp:Button Text="Arrived" ID="ArrivedTabButton" CssClass="tabButton" runat="server" OnClick="ArrivedTab_Click" />
code behind
protected void AllTab_Click(object sender, EventArgs e)
{
AllTabButton.CssClass = "tabButtonClicked";
ArrivedTabButton.CssClass = "tabButton";
statusFilter.Visible = true;
statusFilterLabel.Visible = true;
}
protected void ArrivedTab_Click(object sender, EventArgs e)
{
AllTabButton.CssClass = "tabButton";
ArrivedTabButton.CssClass = "tabButtonClicked";
statusFilter.Visible = false;
statusFilterLabel.Visible = false;
}
The only problem is that if I try to set Visible=true after setting Visible=false it would give me an error Unable to find control with id 'statusFilter' that is associated with the Label 'statusFilterLabel'.
I tried doing some other things instead of using Visible, like setting the style: statusFilter.Style.Add("display", "block") and setting the cssclass: statusFilter.CssClass = "displayBlock"but the resulting error always showed up.
An asp:Panel would work, but I'm avoiding using that because I want my asp:Label and asp:DropDownList to line up with several other labels and dropdownlists; putting in a panel would make them not line up properly.
I'm guessing there is something I'm missing, something I just don't get, but I can't seem to figure out what that is. If anybody has any clue as to what's happening, I would really appreciate the help!

It's not able to always find the control on postback because it's a child of statusFilter. Move the input field outside of the label:
<asp:Label AssociatedControlID="statusFilter" id="statusFilterLabel" runat="server" CssClass="filterLabel">Status
</asp:Label>
<asp:DropDownList ID="statusFilter" runat="server" CssClass="filterInput" AutoPostBack="true" OnSelectedIndexChanged="anyFilter_SelectedIndexChanged" AppendDataBoundItems="True">
<asp:ListItem Selected="True" Value=" 0"><All></asp:ListItem>
</asp:DropDownList>

Getting Gidview Hidden field value on button click in ASP.NET

I have a Gridview dtAppend. I want that when I press delete button the selected row record should be deleted from users table.
I first used button field in gridview, as:
<asp:ButtonField Text="Delete" CommandName="DeleteRow" ControlStyle-CssClass="btn btn-danger btn-small" ControlStyle-ForeColor="White" />
<asp:TemplateField visible="false" ItemStyle-Width="0px">
<ItemTemplate>
<asp:HiddenField ID="HiddenField" Visible="false" runat="server" Value='<%# Eval("userId") %>' />
</ItemTemplate>
</asp:TemplateField>
My client says to show JavaScript alert and on clicking yes the record should be deleted. I cannot write onClientClick for button field so I am being forced to use normal Asp button.
on rowCommand of gridview I am getting the hidden field value in this code
if (e.CommandName == "DeleteRow")
{
GridViewRow row = dtAppend.Rows[Convert.ToInt32(e.CommandArgument)];
hidden1 = (HiddenField)row.Cells[6].FindControl("HiddenField");
string text = Convert.ToString((HiddenField)row.Cells[6].FindControl("HiddenField"));
Session["dtIdDel"] = hidden1.Value;
}
i am getting thew value in Session but i need above code working Button_ClickEvent like below
protected void deleteButton_Click(object sender, EventArgs e)
{
GridViewRow row = dtAppend.Rows[Convert.ToInt32(e.CommandArgument)];
hidden1 = (HiddenField)row.Cells[6].FindControl("HiddenField");
string text = Convert.ToString((HiddenField)row.Cells[6].FindControl("HiddenField"));
Session["dtIdDel"] = hidden1.Value;}
this is where 'e.CommandArgument' gives Error
I cannot use the above code in normal button click as it gives error in e.CommandArgument
Any help?

Simply you can remove visible="false"
<asp:HiddenField ID="HiddenField" runat="server" Value='<%# Eval("userId") %>' />

You Better Remove Visible="false" . Because, the value that has to be binded for hidden field will not be binded in to the field if Visible="false" is there. Any how its a hidden field, so make it Visible="true"
EDIT :
How you handled the RowDataBound event of the Grid, are you assigning the CommandArgument for each row, other wise the above concept will not work in Paging. Refer as below
Ex : -
Button btnMail = (Button)e.Row.FindControl("lnkMail");
btnMail.CommandArgument = e.Row.RowIndex.ToString();

I think this would be easy way, instead of using hidden field.
<asp:LinkButton CommandArgument='<%# Eval("userId") %>' OnClientClick="if (!confirm('Are you sure you want delete?')) return false;" CommandName="DeleteRow" ID="eliminar" runat="server" Text="delete"/>
if (e.CommandName == "DeleteRow")
{
int userId = Int32.Parse(e.CommandArgument.ToString());
}

You can simply send ID as command argument
or
Try the code as below:
var ID = int.Parse(((HiddenField)item.FindControl("HiddenField1")).Value);
sql = "delete from tablename where id=" + ID;

Update panel with textbox values when button clicked

I am still learning the basics of C# so any help would be appreciated. I have a series of asp:TextBox's. In the code behind, I am getting the value of these boxes. Is there a way to have a panel hidden until a user clicks submit then have the values display?
Here is the HTML for one of the boxes and the panel:
<asp:TextBox ID="txtTitle" runat="server></asp:TextBox>
<asp:Panel ID="PDFPanel" runat="server"></asp:Panel>
The button:
<asp:Button ID="btn_Submit" runat="server" Text="Button" OnClick="btnSubmit"/>
and the code-behind for it:
string Title = txtTitle.Text;
public void btnSubmit(Object sender, EventArgs e)
{
}
There are about 50 fields, so I am not showing all of it but if I can get direction on one I can replicate for the rest. Please let me know if I need to show any additional code
I am sorry if this is simple, but like I said, I am still an entry level developer. Thanks in advance!

Unless I've misunderstood what you're asking, this should be fairly simple.
<asp:Panel ID="PDFPanel" runat="server" Visible="False">
<div>
<asp:Literal id="litTitle" runat="server" />
</div>
</asp:Panel>
then in your click method:
litTitle.Text = txtTitle.Text;
PDFPanel.Visible = true;

Set the Panel's visibility to false by default
<asp:Panel ID="PDFPanel" runat="server" Visible="false">
<asp:TextBox ID="txtTitle" runat="server"></asp:TextBox>
</asp:Panel>
then on the Button's click event set the visibility to true
public void btnSubmit(Object sender, EventArgs e)
{
PDFPanel.Visible = true;
// do something else...
}

OnItemCommand function not working with asp Linkbutton in Listview

I´m having some wierd issus with my asp:Linkbutton functionality in my asp:ListView.
Here is my code:
<asp:ListView ID="lvData" runat="server" OnItemCommand="lvData_ItemCommand" OnItemDataBound="lvData_ItemDataBound">
<LayoutTemplate>... </LayoutTemplate>
<ItemTemplate>
...
<td>
<asp:LinkButton ID="ItemLink" runat="server" CommandName="View" Text='<%# Eval("NameOfBatch")%>'></asp:LinkButton>
</td>
...
my code-behind is like this:
protected void lvData_ItemCommand(object sender, ListViewCommandEventArgs e)
{
string smu = "";
}
if I put a breakpoint on string smu it never goes there.
The only thing that happens is that my table dissapears and nothing else.
Do you have any ideas ?

Set the CausesValidation property to false on the controls if you have validation on the form and don't want them to trigger the validation.