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The error typically occurs when there is an issue with unrecognized tags within your application. This could happen if you are using a tag that is not recognized or if there's a syntax error in your markup. Show some code so we can understand the error rather than trying to read minds on where the issue is occurring. 
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I want to build my own gallery module and add it into Umbraco CMS.
is it difficult to do this?
diligent hands rule....
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I am planning the development of ASP.NET Core MVC Razor application and am looking for FREE library of some quality that supports MVC/Razor development. I see plenty of commercial libraries like Kendo UI that can be used, but I am looking for something like Open Source Material Design. As far as I know, Material UI is usable only from SPA/React, and I want to develop MVC/Razor application that is Round-trip (Request/Response), not an SPA application like React.
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Hello
Please note that I am sorry to take anyone's time out of whatever busy life they might have. So I have a professional class project which unfortunatly is related to coding even though its just about the first and last time this is supposed to happen. I am supposed to write a .net code in VS for windows VM that will show ip address of the VM from a browser. I am not a programmer nor any career close to that so I am completely stuck and dont want to just call it a day without trying every possible avenue on the internet. I have been on this for 24hrs trying on my own with different online forums even chatgpt/Bard but to no avail so I need help. Just help write the code to help a brother out please. I saw that VS has a bunch of asp.net templates so I kept shoveling between asp.net core web api and asp.net web app (razor pages) but no luck. This project is in aws and its part of the requirement I need to complete the project.
Am gratefull
modified 25-Nov-23 0:11am.
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Sorry, but this site does not provide code to order. You need to go back to your teacher and explain why this task is beyond your capabilities.
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Maybe view the question below this one, Richard has added very valuable links that will point you in the right direction - Starting in ASP.NET[^]
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appache05 wrote: I am supposed to write a .net code in VS for windows VM that will show ip address of the VM from a browser
Just noting that if one has no programming experience then this is a very difficult project to start with.
So something odd is going on. For example you skipped a pre-requisite class. Or the teacher doesn't know what they are doing. Or perhaps you only needed to select a project from a multiple selection and you selected one that did not fit your skill set.
appache05 wrote: though its just about the first and last time this is supposed to happen.
...or perhaps you are mistaken about that in terms of what the class is doing in general.
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I am a consultant, not a developer, so I mainly develop small customizations to my company's software as opposed to coding entire applications from scratch and selling them.
I have basic experience with HTML, though admittedly I've never personally written HTML code that has a div tag. I'm somewhat familiar with XML style sheets but it's been awhile. I remember that classic ASP code basically just dynamically produced HTML and sent it from the server to the client - I'm honestly not sure whether or not ASP.Net does the same thing. I'm somewhat familiar with JavaScript and VBScript and somewhat understand the difference between client-side code and server-side code. I've heard that there's this thing called Ajax - all I really know about it is that it makes it easier to write client-side code that actually interacts with the server. I've heard that my company's website uses the React framework but I don't know what that is. Regardless, ASP.Net web parts can be coded and then "pasted into" custom areas on the company's website. There are very rare needs to code entire ASPX web pages, but the ASCX controls are used a LOT.
I need to get to the point where I can code reasonably complex and dynamic ASP.Net web parts to paste into the main website. There are frequent business needs for which the right technical solution is either client-side code, server-side code or both. In most cases, the user interface is fairly simple, but I've seen some get fairly complex, i.e. the entire form can change based on a selection in a dropdown (i.e. a dropdown could include 4 or 5 different reports they can generate, and the input into each report could be totally different). I've also seen web parts that actually have a dynamic number of dropdowns on them (how that could POSSIBLY be the most efficient user interface for a given business need is beyond me, but I've seen it happen.
So here's the question - based on what little I know, what should I start studying/reading/practicing to get to where I can reach my goal? Any suggested online training sites and/or books I could buy to start learning?
Hope I elucidated the question sufficiently for it to be actionable.
Thanks
DalTXColtsFan
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I wish it was a little easier to post screenshots here, but what's going on is my SelectedIndexChanged event handler is being triggered if I choose any item in the dropdown OTHER THAN THE TOP ONE. When I choose the top item in the dropdown, Page_Load is getting fired, but not SelectedIndexChanged. What's going on?
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="First2023WebUserControl.ascx.cs" Inherits="First2023Control.UserControls.First2023WebUserControl" %>
<asp:Label ID="Label1" runat="server" Text="Hello Year 2023"></asp:Label>
<p>
</p>
Category:<asp:DropDownList ID="ddlCategory" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlCategory_SelectedIndexChanged">
</asp:DropDownList>
<p>
Subcategory:
<asp:DropDownList ID="ddlSubcategory" runat="server" AutoPostBack="True">
</asp:DropDownList>
</p>
<p>
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
</p>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
protected void Page_Load(object sender, EventArgs e)
{
Label3.Text = "In Page Load selected index is " + ddlCategory.SelectedIndex.ToString();
XXXDbSupport objDBSupport = new XXXDbSupport();
DbCommand objDBCommand = objDBSupport.CreateDbCommand();
objDBCommand.CommandType = CommandType.Text;
string sSQL = "select distinct isnull(Category,'(blank)') as ProdCat from xxx_product order by isnull(Category,'(blank)')";
objDBCommand.CommandText = sSQL;
DataTable objDBTable = objDBSupport.FillDataTable(objDBCommand);
if (objDBTable.Rows.Count > 0)
{
ddlCategory.DataTextField = "ProdCat";
ddlCategory.DataValueField = "ProdCat";
ddlCategory.DataSource = objDBTable;
ddlCategory.DataBind();
}
else
{
ddlCategory.Text = "n/a";
}
}
protected void ddlCategory_SelectedIndexChanged(object sender, EventArgs e)
{
Label2.Text = "The selected index changed to " + ddlCategory.SelectedIndex.ToString();
XXXDbSupport objDBSupport = new XXXDbSupport();
DbCommand objDBCommand = objDBSupport.CreateDbCommand();
objDBCommand.CommandType = CommandType.Text;
string sSQL = "select distinct isnull(SubCategory,'(blank)') as SubCat from xxx_product ";
if (ddlCategory.Text == "(blank)")
{
sSQL = sSQL + "where isnull(Category,'(blank)') = '(blank)' order by isnull(SubCategory,'(blank)')";
}
else
{
sSQL = sSQL + "where Category = '" + ddlCategory.Text + "' order by isnull(SubCategory,'(blank)')";
}
objDBCommand.CommandText = sSQL;
DataTable objDBTable = objDBSupport.FillDataTable(objDBCommand);
if (objDBTable.Rows.Count > 0)
{
ddlSubcategory.DataTextField = "SubCat";
ddlSubcategory.DataValueField = "SubCat";
ddlSubcategory.DataSource = objDBTable;
ddlSubcategory.DataBind();
}
else
{
ddlSubcategory.Text = "n/a";
}
}
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Stick your Page_load code inside a !Postback and see what happens.
if (!IsPostBack)
{
}
Jack of all trades, master of none, though often times better than master of one.
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When I do that the dropdowns don't get refreshed at all. Isn't that what's expected? When the user chooses an entry from the dropdown is issues a postback, so Page_Load won't do anything unless !IsPostBack is True, which it won't be.
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You should only populate the dropdown list during the initial page load and not on subsequent 'postbacks'. You can do this by wrapping your code inside the 'Page_Load' event with a check for '!IsPostBack' -
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Label3.Text = "In Page Load selected index is " + ddlCategory.SelectedIndex.ToString();
XXXDbSupport objDBSupport = new XXXDbSupport();
DbCommand objDBCommand = objDBSupport.CreateDbCommand();
objDBCommand.CommandType = CommandType.Text;
string sSQL = "select distinct isnull(Category,'(blank)') as ProdCat from xxx_product order by isnull(Category,'(blank)')";
objDBCommand.CommandText = sSQL;
DataTable objDBTable = objDBSupport.FillDataTable(objDBCommand);
if (objDBTable.Rows.Count > 0)
{
ddlCategory.DataTextField = "ProdCat";
ddlCategory.DataValueField = "ProdCat";
ddlCategory.DataSource = objDBTable;
ddlCategory.DataBind();
}
else
{
ddlCategory.Text = "n/a";
}
}
}
protected void ddlCategory_SelectedIndexChanged(object sender, EventArgs e)
{
Label2.Text = "The selected index changed to " + ddlCategory.SelectedIndex.ToString();
XXXDbSupport objDBSupport = new XXXDbSupport();
DbCommand objDBCommand = objDBSupport.CreateDbCommand();
objDBCommand.CommandType = CommandType.Text;
string sSQL = "select distinct isnull(SubCategory,'(blank)') as SubCat from xxx_product ";
if (ddlCategory.Text == "(blank)")
{
sSQL = sSQL + "where isnull(Category,'(blank)') = '(blank)' order by isnull(SubCategory,'(blank)')";
}
else
{
sSQL = sSQL + "where Category = '" + ddlCategory.Text + "' order by isnull(SubCategory,'(blank)')";
}
objDBCommand.CommandText = sSQL;
DataTable objDBTable = objDBSupport.FillDataTable(objDBCommand);
if (objDBTable.Rows.Count > 0)
{
ddlSubcategory.DataTextField = "SubCat";
ddlSubcategory.DataValueField = "SubCat";
ddlSubcategory.DataSource = objDBTable;
ddlSubcategory.DataBind();
}
else
{
ddlSubcategory.Text = "n/a";
}
}
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OK, I'll put this in as few words as possible, and please bear with me if I am not clear, I'm still relatively new to this stuff:
So my company has a website we roll out to our customers, and the developers provided a base class to the consultants to use to create custom web parts. The website has a "design mode" built into it where an admin can divide the page up into sections, and basically assign a custom web part to that section of the page. The ascx and dll for the web part obviously have to be on the IIS server where the website can "see" it. I'm not sure exactly how that works technologically, i.e. if it's a master page with individual pages or if it's like a div or whatever.
Anyway, I tried to create a simple webpart with two dropdowns, one of which depends on the other, and a button. The labels and dropdowns appear to be initializing correctly. When I click the button, it correctly updates the label but it clears the dropdowns. Changing the selection in either dropdown appears to re-initialize the entire form including clearing the dropdowns.
Lastly, I could be wrong but I don't believe that the code in ddlCategory_SelectedIndexChanged is getting fired as a result of the dropdown getting clicked - I think it's only getting ran when I call it explicitly. Again, I could be wrong, but I feel like any time a "postback" is issued, only Page_Load is getting fired off, and the controls are all getting cleared/initialized before any of the code in Page_Load is actually run.
I'll pause there for a moment - does anyone see anything in *my* code that could be causing this incorrect result? Before I talk about how I could troubleshoot it within the framework of the rest of my company's website let's establish that.
Thanks
DTXCF
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="First2023WebUserControl.ascx.cs" Inherits="First2023Control.UserControls.First2023WebUserControl" %>
<asp:Label ID="Label1" runat="server" Text="Hello Year 2023"></asp:Label>
<p>
</p>
Category:<asp:DropDownList ID="ddlCategory" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlCategory_SelectedIndexChanged">
</asp:DropDownList>
<p>
Subcategory:
<asp:DropDownList ID="ddlSubcategory" runat="server" AutoPostBack="True">
</asp:DropDownList>
</p>
<p>
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
</p>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Custom1.Custom2.Web.Framework;
namespace First2023Control.UserControls
{
//public partial class First2023WebUserControl : System.Web.UI.UserControl
public partial class First2023WebUserControl : Custom1.Custom2.Web.Framework.UserControlBase
{
[Property(DisplayName = "Message Text")]
public string MessageText
{
get
{
return Label1.Text;
}
set
{
Label1.Text = value;
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack == false)
{
ddlCategory.Items.Add("FirstCat");
ddlCategory.Items.Add("SecondCat");
ddlCategory_SelectedIndexChanged(sender, e);
}
else
{
Label1.Text = "I posted back";
}
}
protected void ddlCategory_SelectedIndexChanged(object sender, EventArgs e)
{
Label2.Text = "The selected index changed";
if (ddlCategory.SelectedValue == "FirstCat")
{
ddlSubcategory.Items.Clear();
ddlSubcategory.Items.Add("FirstCatFirstSubCat");
ddlSubcategory.Items.Add("FirstCatSecondSubCat");
}
else
{
ddlSubcategory.Items.Clear();
ddlSubcategory.Items.Add("SecondCatFirstSubCat");
ddlSubcategory.Items.Add("SecondCatSecondSubCat");
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Label3.Text = "Someone clicked the button";
}
}
}
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Your issue might be related to the page lifecycle and the way ASP.NET handles postbacks.
The key part of your issue is likely in your 'Page_Load' method where you are clearing and populating the dropdown list only if it's not a postback. The 'Page_Load' event occurs before the 'Button1_Click' event, so when you click the button, the 'Page_Load' event is triggered again before the button click event, and the dropdowns are reinitialized, you can change the behaviour -
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ddlCategory.Items.Add("FirstCat");
ddlCategory.Items.Add("SecondCat");
ddlCategory_SelectedIndexChanged(sender, e);
}
else
{
Label1.Text = "I posted back";
}
}
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Thanks for the reply.
So Page_Load always re-initializes controls every time it's invoked, and any postback always triggers Page_Load?
If it's clearing and re-populating the dropdowns every time it posts back, how is it possible to code it in such a way that the SubCategory dropdown's values depend on the selected value of Category?
Again, sorry if I'm not asking the right questions, I hope this makes sense.
Thanks
DTXCF
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Yes, the 'Page_Load' event is triggered on every request to the page, including postbacks. This means that any code within the 'Page_Load' method will execute during each page load, whether it's an initial request or a postback.
You can try and use the 'SelectedIndexChanged' event of your Category dropdown 'ddlCategory' to dynamically populate the 'SubCategory' dropdown named 'ddlSubCategory'' based on the selected value of Category, similar to -
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ddlCategory.Items.Add("FirstCat");
ddlCategory.Items.Add("SecondCat");
ddlCategory_SelectedIndexChanged(sender, e);
}
}
protected void ddlCategory_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedCategory = ddlCategory.SelectedValue;
ddlSubCategory.Items.Clear();
if (selectedCategory == "FirstCat")
{
ddlSubCategory.Items.Add("SubCat1A");
ddlSubCategory.Items.Add("SubCat1B");
}
else if (selectedCategory == "SecondCat")
{
ddlSubCategory.Items.Add("SubCat2A");
ddlSubCategory.Items.Add("SubCat2B");
}
}
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When I try to build my project with azure pipeline (or even my PC), using that command line:
dotnet.exe publish C:\..\Produce.csproj --configuration Release -r win-x64 --self-contained true --output C:\..\Produce5
I got same version number as my computer and this error, all the time, almost immediately:
MSBuild version 17.7.1+971bf70db for .NET
...
C:\Program Files\dotnet\sdk\7.0.400\Sdks\Microsoft.NET.Sdk.BlazorWebAssembly\targets\Microsoft.NET.Sdk.BlazorWebAssembly.6_0.targets(325,5)
error MSB4018:
The "GenerateBlazorWebAssemblyBootJson" task failed unexpectedly. [C:\...\Parts.Production.Blazor.csproj]
System.IO.IOException: The process cannot access the file 'C:\..\Parts.Production.Blazor\obj\Release\net7.0\blazor.boot.json' because it is being used by another process. [C:\..\Parts.Production.Blazor.csproj]
The funny thing is, the whole thing build fine with visual studio!
Any idea what's wrong, or what I could do?
Perhaps, Visual Studio 2022 is not using Microsoft.NET.Sdk.BlazorWebAssembly.6_0.targets and I too can avoid it with the command line?
REMARK
adding -maxcpucount:1 to the command line fixes this build job step, but it's a lot slower (obviously) and the whole solution pipeline build job still fails because it's now taking more than an hour... 
modified 6-Sep-23 23:21pm.
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Well.. Turns out it's just dotnet publish having an issue with dependencies...
We had A depending on B and C and B depending on C like so
ProjectA
--> ProjectB --> ProjectC
--> ProjectC
Where ProjectC was the Blazor project, and ProjectA was the entry web project being compiled.
Normally this is not a problem, but for Blazor it is, for some reason. So removed ProjectC as an explicit reference of ProjectA and it now compiles!
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I have an existing MVC app, to which I added some Blazor components on some pages.
I.e. instead of starting a new fully Blazor app, I am trying to extend the functionality of an existing app.
I am using WebAssembly rendering, particularly as they are interactive components (updating the UI, doing web service calls, etc..)
It's all working very well except... I can't use breakpoint / debug the components! 
Any clue on how to enable debugging of Blazor component on an MVC view?
modified 23-Aug-23 20:28pm.
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In the end, I am loading some debug razor (blazor?) Page from the Blazor project.
When the whole page is a blazor page, debugging works fine again!
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How cam i keep the data source of htmlselect control after postback ?
( I have 14 select controls and don ot wantto load data from db)
**I need the control to not do postback when changed and have both server and client script there for I diddn't use
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That entirely depends on how you bind it to the data source. Are you using a data source control and setting the DataSourceID? Are you setting the DataSource property in code and then calling DataBind? Or are you adding the items manually through code on the server?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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