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How to bind images from TreelistEx to a repeater in Sitecore

I'm not sure if this is the right approach, but still went ahead.
The template has these fields
Description [Rich Text]
Images [TreelistEx]
User will select pics from the media library using the TreelistEx field, which later would be displayed in a carousel. User should also be able to edit those images.
My code is not displaying any images.
aspx:
<div class="toggle_1bs">
<asp:Repeater ID="rpImages" runat="server" OnItemDataBound="rpImages_ItemDataBound"
ItemType="Sitecore.Data.Items.Item">
<HeaderTemplate>
<div id="1bs" class="owl-carousel">
</HeaderTemplate>
<ItemTemplate>
<div class="item">
<sc:Image ID="imgMain" Field="Images" runat="server" CssClass="img-full"
Item="<%#Container.DataItem %>"/>
</div>
</ItemTemplate>
<FooterTemplate>
</div>
</FooterTemplate>
</asp:Repeater>
</div>
aspx.cs:
private void BindData()
{
//bind data to the repeater
MultilistField offerImages = (MultilistField)offerDetails.Fields["Images"];
rpImages.DataSource = offerImages.GetItems();
rpImages.DataBind();
}
protected void rpImages_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
var mainItem = (Item)e.Item.DataItem;
if (mainItem != null)
{
var imgMain = (Image)e.Item.FindControl("imgMain");
if(imgMain != null)
{
if (!string.IsNullOrEmpty(MediaManager.GetMediaUrl(mainItem)))
imgMain.DataSource = MediaManager.GetMediaUrl(mainItem);
//Response.Write(MediaManager.GetMediaUrl(mainItem));
}
}
}
There are 2 images added using the treelist control and I can see the html rendered for the 2 images (<div class="item"></div>).

You don't have field which is an Image type field. That's why you cannot use sc:Image like that.
You're getting list of media items from your TreeListEx.
Remove your rpImages_ItemDataBound and try something like this instead:
<ItemTemplate>
<img src='<%# Sitecore.StringUtil.EnsurePrefix('/', Sitecore.Resources.Media.MediaManager.GetMediaUrl((Sitecore.Data.Items.Item)Container.DataItem)) %>' />
</ItemTemplate>

Bind SC Images in Sitecore

I'm having a repeater control and want to bind Images to the sc control for onitemdatabound event.
My markup is:
<sc:Link runat="server" ID="sclnk" Field="#" rel="iframe-960-540">
<sc:image id="scimage" runat="Server" field="#">
</sc:image>
</sc:Link>
And my code is:
Sitecore.Web.UI.WebControls.Link scBannerLink = e.Item.FindControl("sclnk") as Sitecore.Web.UI.WebControls.Link;
if (scBannerLink != null)
{
scBannerLink.DataBind(promoItem.ID.ToString(), promoItem.PromoLink.Field.InnerField.Name);
}
Sitecore.Web.UI.WebControls.Image scPromoImage = e.Item.FindControl("scimage") as Sitecore.Web.UI.WebControls.Image;
if (scPromoImage != null)
{
scPromoImage.DataBind(promoItem.ID.ToString(), promoItem.PromoImage.Field.InnerField.Name);
}
I'm not getting any error but not diaplaying images

I've never used the Databind method of the control to set the properties.
The easier solution is to specify the Fieldname and set the Item in your repeater:
<asp:Repeater runat="server" ID="rptImages">
<ItemTemplate>
<sc:Link runat="server" ID="scLnk" Field="MyLinkFieldName" Item="<%# Container.DataItem %>" Parameters="rel=iframe-960-540">
<sc:image id="scImage" runat="Server" Field="MyImageFieldName" Item="<%# Container.DataItem %>" />
</sc:Link>
</ItemTemplate>
</asp:Repeater>
And you can pass in the additional attributes in the Parameters field on the control as a URL encoded parameters string, e.g. Parameters="rel=iframe-960-540&param2=value2&param3=value3"
And your code behind binding the control should be:
protected void Page_Load(object sender, EventArgs e)
{
rptImages.DataSource = Sitecore.Context.Item.GetChildren(); // this needs to be changed to whatever your query is...
rptImages.DataBind();
}

Label ASP not being set

I have a label that is dynamically generated via a repeater, rollNo is a label that's a part of the itemTemplate. When I check the value of l, it goes in the if block but l.Text is still empty. check.Text only returns "d". Why?
Label l = (Label)item.FindControl("rollNo");
TextBox t = (TextBox)item.FindControl("quiz1");
if (l != null)
{
string a = l.Text;
check.Text = "d"+a;
}

Your code sample isn't complete as it has no rollNo in it, but I can tell you something...
You are using repeater and with that using template...The id you use inside the template is never will be the run-time id of any of your controls! Think about it! Let say you assigned rollNo to one of the elements in the template and you have 10 rows to pass to the repeater. Are you expecting to have 10 controls with the the same id of rollNo?! I hope not!
For that reason FindControl will return nothing while using on id inside a template...
You have to rethink what do you want or use a different approach to find the controls (loop)...

Repeater Markup:
<asp:Repeater id="Repeater1" runat="server" OnItemCommand="Repeater1_ItemCommand">
<ItemTemplate>
<tr onclick="rowReturn(this)">
<td><asp:Label CssClass="form-control" runat="server" ID="rollNo"><%# DataBinder.Eval(Container.DataItem, "sid") %></asp:Label></td>
<td><asp:TextBox CssClass="form-control" runat="server" ID="quiz1" required></asp:TextBox></td>
<td><asp:TextBox CssClass="form-control" runat="server" ID="quiz2" required></asp:TextBox></td>
<td><asp:Button CssClass="btn btn-success btn-sm form-control" ID="add" CommandName="add" runat="server" Text="Add" CommandArgument='<%#DataBinder.Eval(Container.DataItem, "sid") %>' /></td>
</tr>
</ItemTemplate>
Code Behind:
TextBox t1;
TextBox t2;
string rollNumber, T1, T2;
if (e.CommandName == "add")
{
// get CommandArgument you have selected on the button
string roll = e.CommandArgument.ToString();
rollNumber = roll;
foreach (RepeaterItem item in Repeater1.Items)
{
t1 = (TextBox)item.FindControl("quiz1");
t2 = (TextBox)item.FindControl("quiz2");
T1 = t1.Text;
T2 = t2.Text;
//...DB code or any other code
}
}

Using markup in label text or similar element

I have
<asp:Label ID="lbl_ReadOnlyFld" runat="server"></asp:Label> <%=GetGuiLocalString("lbl_ReadOnlyFldDescr")%>
I need the text in some element so I can access it:
For example:
<asp:Label ID="lbl_InputFld" runat="server"></asp:Label><asp:Label ID="lbl_InputFldDescr" runat="server" text=' <%= GetGuiLocalString("lbl_InputFldDescr")%>'></asp:Label>
It just gives me stuff inside ''... any help would be appreciated.
Regards.

<%= is meant to directly output something on the page and can't be used inside other controls.
You should either use <%# and databind the control or set the text in the code behind. Also the other stuff should be inside those tags so it would be:
<asp:Label ID="lbl_InputFldDescr" runat="server" text='<%# " " + GetGuiLocalString("lbl_InputFldDescr")%>' />
and then lbl_InputFldDescr.DataBind(); somewhere in your code behind (provided you don't already databind the page or someting).

ASPX:
<asp:Label ID="lbl_InputFld" runat="server">my name is Jhon</asp:Label>
<asp:Label ID="lbl_InputFldDescr" runat="server" text='<%# " " + GetGuiLocalString("lbl_InputFldDescr")%>'></asp:Label>
Code behind:
protected void Page_Load(object sender, EventArgs e)
{
DataBind();
}
public string GetGuiLocalString(string id)
{
string s = "hello";
Label lbl = (Label)Form.FindControl(id);
if(lbl!=null)
{
if ( ! string.IsNullOrEmpty(lbl.Text))
s = lbl.Text;
}
return s;
}

How to access a legend tag from code

I have the following data-bound repeater code :
<%--categories--%>
<asp:Repeater ID="CategoryRepeater" runat="server" OnItemDataBound="ItemBound">
<ItemTemplate>
<div class="groupbox">
<fieldset>
<legend><%# Container.DataItem %></legend>
<table>
<asp:Repeater ID="ItemRepeater" runat="server">
<ItemTemplate>
<tr>
<td>
<asp:CheckBox id="chkItem" runat="server" Text='<%# Eval("Text")%>' />
<asp:HiddenField id="pgNos" runat="server" Value='<%# Eval("PGNos")%>' />
<asp:Button ID="btnXRefs" Text="x-refs" runat="server" CssClass="xRefButton" OnClick="btnSelectXRefs_Click" />
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
</table>
</fieldset>
</div>
</ItemTemplate>
</asp:Repeater>
There is a repeater inside a repeater. How do I access the text inside the legend (<legend><%# Container.DataItem %></legend>) from code?
I tried :
foreach (RepeaterItem cr in CategoryRepeater.Items)
{
string heading = (string) cr.DataItem; // returns null
}

Container.DataItem is a runtime alias for the DataItem for this specific item in the bound list. For a Repeater which displays 10 rows of data, this is one row from the datasource...Basically, it's a specific row and at runtime you can get the Property Values from this row
I saw your above Mark Up...Seems like you are missing to mention the property of Data-Bound type Class like below.
<%# ((Your Class Name)Container.DataItem).Class Property Name %>
There is a repeater inside a repeater. How do I access the text inside
the legend (<%# Container.DataItem %>) from code?
As told by phemt.latd, you can change the Legend tag into server side control like below.
<legend id="lg" runat="server">
<%# ((Your Class Name)Container.DataItem).Class Property Name %>
</legend>
Now, in the Item-Bound Data Event, Find the Legend Control.
protected void rpt_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
HtmlGenericControl ctl = (HtmlGenericControl)e.Item.FindControl("lg");
ctl.InnerText //This is what will give you the result.
}
}

The legend tag that you use is not visible on server side. Is a client control and not a server one.
Try with this:
<legend id="myLegend" runat="server"><%# Container.DataItem %></legend>
Then in codebehind:
protected void ItemBound(Object sender, RepeaterItemEventArgs e)
{
if (e.Item.DataItem == null) return;
HtmlGenerics body = (HtmlGenerics)e.Item.FindControl("myLegend");
body.InnerText = "Foo";
}