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How to display a search result in a treeview

Currently, I'm working in a MVC project (this is my first project). I'm doing fine but I'm stuck somewhere. I hope someone will help me out with this.
In this project I have to search for a record (with id) in SQL database from visual studio, where I should get result in a treeview... like under ID we may have a lot of sub ids or may not, if we have one sub id, it should display one if we have multiple sub ids multi-level treeview should display.
Note: This result I should get from the database when the user searched for particular id only, DATA from the database should not be loaded with the page.

Create a tree view using css and html. Populate the value using a rest controller or controller.
create an arraylist which returns your search result.
return the value from the list to a model or a url using a function.
As you can see there are many ways you can do this.
you can check this out as well: https://www.c-sharpcorner.com/UploadFile/85ed7a/searching-records-from-database-and-display-in-gridview-and/
and for only loading id from the database you can run
Select id From tablename
and if you want the details only after user clicks the id
Select * From tablename Where id = clickedvalue
you could also use where statement in sql to have more specific values
you'll need to change few codes as this tutorial uses grid view.
i hope this helps. But please provide some code snippets of what you've done or where you're stuck to get a precise answer.

How to generate dynamic multi-dimensional list or array and insert data accordingly based on a dynamic SQL Server table in c#?

I want to create a dynamic 2-dimensional array (or any other structure) based on a dynamic database table in C# or T-SQL, which means the data source (which is a database table) is dynamic too.
EDIT:
Table structure:
For example:
If User1 meets the condition of Admin and Group1, it will be inserted into (Admin, Group1). And the users are constantly added in with different user type and group. So, every cellular can have as many as users.
And the problem is I don't know how many user types and groups there are, because new user types and new groups are added constantly too.
For now, I think I need to parse every data to find if it meets the existing conditions. If yes, insert it into the specific condition; if not, create a new condition and insert data into it.
But I don't have any idea about how to implement it? Do you have any ideas or algorithms?
Thanks very much for any suggestion or information.

I've solved this statically with Tuple, but not dynamically. I think I should re-fresh my tuple list periodically. But at least, it works now!
Any suggestions are welcome! Thanks!

What is the best way to create a GridView showing summary sales data?

I have developed an eCommerce application in C# and ASP.Net. For the Admin users "dashboard" landing page, I would like to give them a GridView that shows them the total sales dollar amount for a couple different time ranges, these would be my columns (ie last day, last week, last month, last year, total ever). I would like to give these values for orders that are in different status' (ie complete, paid but not shipped, in progress). Something similar to this:
|OrderStatus|Today|LastWeek|LastMonth|
|Processed |$10 |$100 |$34000 |
|PaidNotShip|$4 |$12 |$45 |
My question: What is the best/most efficient way to do this? I know that I could write separate SQL statements and union them together and bind the gridview to a sqldatasource:
(select amountForYesterday, amountForLastWeek from sales where orderStatus = processed)
UNION
(select amountForYesterday, amountForLastWeek from sales where orderStatus = paidnotshipped)
But that seems like a pain and very inefficient, since I would effectively be writing a separate query for each value.
I could also do this in the .cs page behind on load and programmatically populate the grid view row by row.
This GridView would only show information for the user's specific organization, so it would have to filter based on that as well.
I'm kind of at a loss as to how to do this without writing a massive query and continually hitting that query and database each time the page is viewed.
Any ideas?

I prefer using LINQ to work with data and/or GridViews (accessing the rows etc.). Have a look at a project I have on GitHub, which does exactly what I am mentioning here, as example. Note that this is just a sandbox I used previously for illustration purposes.
GitHub Repo
https://github.com/pauloosthuysen/int
Other useful info:
http://www.codeproject.com/Articles/33685/Simple-GridView-Binding-using-LINQ-to-SQL

The Sales etc. for LastWeek and LastMonth does not change very often. You could store that in a static Dictionary indexed by organization or summarize it in a separate table for faster access. This way you will not need to select the same huge amount of rows to get the same numbers over and over again. Unless special demands I would stick to the Dictionary solution because it is simple but a combination could also be a good solution

There is no direct way of doing it.
However instead of hitting the DB to the sum of every columns, you can perform the stuff using you datatable which is used for binging to your grid.
All you need to do is use
Dim iSumSal As Integer
iSumSal = StudentTable.Compute("SUM(sal)", "")
similarly you can perform for other columns.
once this is done. then just add a new row to you data table with all the summed values in it.
And then you can bind it to your grid.
optional - you can put some text value in the first column of you new row as "Total:"
thanks
rahul

Comparing two datasources in C#

I have a gridview, bound to a datasource whose database table contains a foreign key that is associated with the database table that is used as the datasource for a dropdownlist.
What I want to do is if a certain foreignKeyId exists in gridview.datasource, to remove it from dropdownlist.datasource.
To give a clearer idea of what/why I want what I want, the user is able to add entries to the gridview (and therefore the datasource), but I don't want the user to be able to make more than one entry for a specific type. Is there a way that a linq query could do this?
pseudocode (note that I know RemoveObjects() is an invalid method)
var query = DataContext.Items.Where(item => item.TypeId == selectedTypeId);
dropDownList.DataSource.RemoveObjects(query);
Here is how I bind the dropdownlist, so maybe I could do something here to not get the items with already existing TypeId's?
dropDownList.DataSource = DataContext.Items.Select(items => new
{
items.Name,
items.TypeId,
}).ToList();
Any suggestions or answers would be great!

Have you tried using except
dropDownList.DataSource.Except(query)

Saving multiple items per single database cell

i have a countries list. Each user can check multiple countries. Once saved, this "user country list" will be used to get whether other users fit into countries certain user chose.
Question is what would be the most efficient approach to this problem...
I have one, one to save user selection as delimited list like Canada,USA,France ... in single varchar(max) field but problem with it would be that once user from Germany enters page i perform this check on. To search for Germany i would be needed to get all items and un-delimit each field to check against value or to use sql 'like' which again is pretty damn slow..
If you have better solution or some tips i would be glad to hear.
Just to make sure, many users will have their own selections of countries from which and only they want to have users to land on their page. While millions of users will reach those pages. So the faster approach will be the better.
technology, MSSQL and ASP.NET
thanks

You should not store a list of values in one cell. Consider having a separate table that stores each of the selected countries with a foreign key reference to the user table. This is standard Database Normalization.
PLEASE don't go down the route you're thinking of, storing multiple entries in one field. I've had to re-write more applications because of bad database design than for any other reason, and that is a bad design.
Added
I have this poster on my wall at work: http://www.informationqualitysolutions.com/FreeStuff/rettigNormalizationPoster.pdf
One of my predecessors was a newbie to DB Design, and this helped her a lot. I keep it for any new hires that may need it. It explains normalization very nicely, with examples.

Do not save delimited fields into your database. Your database will not be normalized.
You need a many-to-many table for users and countries:
UserId
CountryId
If you do start using a delimited field, you end up needing to parse it (either in SQL or your Code). It is more difficult to query and optimize.

In this case, you want will want to create a table called UserCountries (or some such) which would store the UserID and CountryID. This is a standard relational construct. To beginners, it seems strange and too involved, but this structure makes it very easy and very fast to write flexible queries against this type of data. No delimiting required!

I think it would be better to use a UserCountry table, which contains a link to the User and the Country table. This creates a lot more possibilities to query against the database. Example queries that are much simpler this way:
Number of Countries per user
All users which selected a particular country
Sort all popular countries

Do not store multiple countries in a single field. Add 2 additional tables - Countries (ID, Name) and UserCountries (UserID, CountryID)