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my error
An entity object cannot be referenced by multiple instances of IEntityChangeTracker.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidOperationException: An entity object cannot be referenced by multiple instances of IEntityChangeTracker.
Line 60: DBLaxmiTatkalEntities2 objentity1 = new DBLaxmiTatkalEntities2();
Line 61:
Line 62: objentity1.TblRootMasterDetails.AddObject(objstud1);
Line 63: objentity1.SaveChanges();
Line 64: }
my code is
public void insertdatarootmasterDetails(TblRootMasterDetail objstud1)
{
DBLaxmiTatkalEntities2 objentity1 = new DBLaxmiTatkalEntities2();
objentity1.TblRootMasterDetails.AddObject(objstud1);
objentity1.SaveChanges();
}
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The error message is quite clear. You have two different context objects trying to load the same entity. That's not supported. Somewhere in your code you have instantiated two DBLaxmiTatkalEntities2 objects and they are both trying to load the same entity, or you have two or more different context objects trying to track the same table.
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When in c# we add any new windows form than that form is by default inherited from the Form class so i want to see this Form class and i want to change something in that by default Form class for my project. So where is this Form class and how i can change it ?
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You can't change the form class (or any of the framework supplied classes). What you can do is inherit from the form class and overload/override the base methods you want to change, adding the methods you need for your custom requirement.
Never underestimate the power of human stupidity
RAH
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As Mycroft says, you cannot change the Form class, any more than you can change all Ford cars to have six wheels becasue the design information is not available to you for modification.
However, there are two ways to do what you want:
1) You can create a new MyForm class, which derives from Form and includes your code. Then use that as the base for your forms instead of the Form class and they will inherit the functionality.
2) You can change the items that are created when you create a new form or a new project by editingthe templates VS uses to create the actual files: Adding your items to Visual Studio default files[^] explains the process.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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Dear All,
My Requirement = I have page on which it having more than 8 tab,I want to display multiple grid onClick of each tab,If i write code in each tab ContentTemplate, my page become to heavy,so it will take lot of time to load.
Current Way = I am using Ajax tab control in one of my project it has ContentTemplate and each ContentTemplate has one iframe, so onclick of each tab related page open in related iframe and all the grid on that page loads.
Problem Current Practice : = No of Pages increases.
Question : Can you suggest me best practice of Tab Concept,So that on each tab click,i should able to load heavy grid, so that each tab content load quickly.
My requirnment is I want to keep Tab Concept only.
Thanking You
modified 15-Apr-14 23:50pm.
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Ask your question in the ASP.NET forum. This really doesn't have anything to do with C#.
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Hello,
I have a window form that have two buttons , (Export & import). How i will can program each one to export all the data in one file and save them in my desktop .And import them again to the program. ??
Any one can help me with source code, I'm using phpmyadmin with C#
Thanks
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Member 10724020 wrote: Any one can help me with source code
Sorry, but this site exists to help people with the code they have written. It does not provide code to order.
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Where are you stuck? It is quite unclear what you are trying to do. What is "all the data" - some data shown on a form, a database (if so: which type), other? Why phpadmin?
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Hye! I have problem with this code..can anyone help me?
SELECT Environmnets.id, Environmnets.TempIn, Environmnets.tempOut, Environmnets.humidity, Environmnets.DateT, Environmnets.Deviceid, Environmnets.House
FROM Environmnets INNER JOIN TDevice ON Environmnets.Deviceid = TDevice.id INNER JOIN TMushroomHouse ON TDevice.MushroomHouseId = TMushroomHouse.id
WHERE (Environmnets.DateT = (SELECT MAX(DateT) AS Expr1
FROM Environmnets AS Environmnets_1), TMushroomHouse.Name='"+ DropDownList1.Text + "'";
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If you encounter a "syntax error", then the command cannot be interpreted because it looks different then the expected form. It also gives a hint about the location of the error.
WHERE (Environmnets.DateT = (SELECT MAX(DateT) FROM Environmnets)
AND TMushroomHouse.Name=@MuschroomHouseName; It's also not a C#-question, but a question on SQL; it would fit better in the database forum.
Concatenating a string into a SQL-statement is asking to be hacked; you'd want to turn that into a parameterized query.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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tqvm on ur reply 
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Member 10724507 wrote: FROM Environmnets AS Environmnets_1), TMushroomHouse.Name='"+ DropDownList1.Text + "'";
should be:
FROM Environmnets AS Environmnets_1) WHERE TMushroomHouse.Name='"+ DropDownList1.Text + "'";
The difficult we do right away...
...the impossible takes slightly longer.
modified 15-Apr-14 16:47pm.
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Tqvm on ur reply i try to change it but it still cannot work 
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Member 10724507 wrote: SELECT Environmnets.id, Environmnets.TempIn, Environmnets.tempOut, Environmnets.humidity, Environmnets.DateT, Environmnets.Deviceid, Environmnets.House
FROM Environmnets INNER JOIN TDevice ON Environmnets.Deviceid = TDevice.id INNER JOIN TMushroomHouse ON TDevice.MushroomHouseId = TMushroomHouse.id
WHERE (Environmnets.DateT = (SELECT MAX(DateT) AS Expr1
FROM Environmnets AS Environmnets_1), TMushroomHouse.Name='"+ DropDownList1.Text + "'";
The issue is with the , before TMushroomHouse.Name. Is this meant to be an AND statement by any chance? By the way, you should really avoid concatenating things in like DropDownList1.Text to prevent opening your app up to SQL Injection Attacks.
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yup..i try to make it like this (Environmnets.DateT =(SELECT MAX(DateT) AS Expr1 FROM Environmnets AS Environmnets_1)) AND TMushroomHouse.Name='"+ DropDownList1.Text + "'";
It doesn't show the error but when i select from dropdownlist, it will not show the output in my textbox
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How to send a message to mobile phone from PC/Laptop By using AT Commands..and also stored the message sending details in sql database.
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Please do not post twice, just edit the first.
Where are you stuck?
There are only 10 types of people in the world, those who understand binary and those who don't.
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And when you have finished not posting twice, just go and see Mr Google - he has lots, and lots of examples of code that does that. In future, please try to do at least basic research yourself, and not waste your time or ours.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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How to send a message to mobile phone from PC/Laptop By using AT Commands..
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how to create multiple events in c#
v.Anilkumar
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for what? you need to explain what you are trying to do.
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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You create them in the same way you create a single event - just more of them. Until you tell us what effect you are after, this is as close to an answer as we can get I'm afraid.
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I have created sms sending using c#.net with at commands through my mobie phone. The msg send to the receiver after unplug the phone from my laptop. Please provide any idea to me. Urgent ........
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