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Put a breakpoint on the line you have put in bold, and when the application breaks here, hover over each value in turn. See which one of those is giving you a null reference (which causes this error). BTW - you are attempting to execute a datareader in your code, and you have nothing to read into it.
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sir when i put breakpoint on that line there is nowhere null show in any field and in every field have value that i had entered during the exucutime time of the program ...
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HELLO SIR MY DATA NOT GOING TO SQL SERVER I DONT KNOW WHY MY CONNECTION STRING IS
<connectionstrings>
<add name="cn" connectionstring="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\database.mdf;Integrated Security=True;User Instance=True"
="" providername="System.Data.SqlClient">
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There's no need to shout - we help out voluntarily, when our schedule permits. You need to step over your code and inspect the variables that are in there - one of them is null. We can't tell which one - only you can do that as you are the one sat in front of your computer.
If you inspect the full exception (use the .ToString() method on the exception rather than just the Message), you should get an idea on which line is at fault - and you can use that to narrow down your debugging.
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my program is executed properly but insert and delete query is not working . i dont know why this not working . i checked the data that is going on the SQLServer but can not inserted in the database so tell my why its not inserted in the database
my inserted query is
cmdd.CommandText = "INSERT INTO registrationn(empname,desgination,emailid,phone,skype,address,shifttime,panel)" + " VALUES (@empname,@desgination,@emailid,@phone,@skype,@address,@shifttime,@panel)";
cmdd.CommandType = CommandType.Text;
cmdd.Connection = conn;
cmdd.Parameters.Add("@empname", SqlDbType.VarChar, 150).Value = empname;
cmdd.Parameters.Add("@desgination", SqlDbType.VarChar, 150).Value = desgination;
cmdd.Parameters.Add("@emailid", SqlDbType.VarChar, 150).Value = emailid;
cmdd.Parameters.Add("@phone", SqlDbType.Int).Value = Convert.ToString(phone);
cmdd.Parameters.Add("@skype", SqlDbType.VarChar, 150).Value = skype;
cmdd.Parameters.Add("@address", SqlDbType.VarChar, 150).Value = address;
cmdd.Parameters.Add("@shifttime", SqlDbType.VarChar, 150).Value = Convert.ToString (shifttime);
cmdd.Parameters.Add("@panel", SqlDbType.VarChar, 150).Value = panel;
//SqlParameter p1 = new SqlParameter("@ret", SqlDbType.VarChar, 150);
//p1.Direction = ParameterDirection.ReturnValue;
cmdd.ExecuteNonQuery();
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Is this a file based SQL Server? Is it part of your solution? If it is, check to see what the properties are that are on your file - if it's set to Copy Always, then it will overwrite the file that is in your Debug or Release directory whenever you build it (and make sure you look at the one that is in that directory rather than the one that is to be copied over).
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sir can u help me if i send u file can u make them in correct way ???? because am in trouble and in my database everything is working but data is not inserted and deleted ...please sir its my request to you for u its just 5 min
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Normally, I'd say no, but if you want to upload it to DropBox and put the link here, I'll d/l it and have a look.
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You'll have to make them public. They won't open for me.
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I'll need to see the whole project as well - including the database.
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sir see the every pages if there is any error in any page the please make them correct and at delete page the data is not deleted , make them correct it also
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As I suspected (and said earlier), your database file is set to copy always. Right click on it in the solution explorer, and select Properties. In that window, look for the Copy to output directory entry and change it to Copy if newer. Basically, what is happening is that every time you compile the program, the "live" version is being overwritten by the original version, so any changes you make in the "live" version are being overwritten by the original. In this case, "live" version means the one that has been copied to your build output directory.
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sir i changed to copy if newer but the data us not inserted at that time also in my database i have changed , sir i want to know that i have to change this copy of output directory at every forms which i have in my project i changed in my program.cs and registration.cs where the data is not inserted in database so tell me now what to do ???????
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sir i changed to copy if newer but the data us not inserted at that time also in my database i have changed , sir i want to know that i have to change this copy of output directory at every forms which i have in my project i changed in my program.cs and registration.cs where the data is not inserted in database so tell me now what to do ???????
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hello someone can help implement huffman Markov of order 1
thanks 
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Before you waste your time waiting for someone to give you the code to do this, I should point out that people aren't in the habit of giving out code here on Code Project. If you search on Google, you may find that someone has posted an implementation, but I would be very surprised if they had.
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good afternoon, how i can looking for, because i had not lucky
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I looked for a source sample and couldn't find any - it looks like you will have to write your code based on the description of the algorithm.
Is this a homework task that you are doing? If so, then your course should have provided the necessary details on this technique.
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Did you try searching[^]? There is some course material and some implementations on the first page.
This is not a website for people to do your homework for you. If you struggle to apply what you're being taught, try talking to your teacher or other students to see if there are learning techniques you are missing.
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This may be a real obvious question, but I am a noob to C# - bing/google is not helping me. It's time to dig into C#, so the first question is what version? I came across a C# Evolution Matrix (clicky[^]) that seems to imply the C# version is joined at the hip with the IDE version:
- VS2005: C# 2.0
- VS2008: C# 3.0
- VS2010: C# 4.0
- VS2011: C# 5.0
I guess it makes sense in a way, but I've not really thought about it or made the connection. If this is the case, then I need 2010 to do C# 4.0.
Charlie Gilley
<italic>You're going to tell me what I want to know, or I'm going to beat you to death in your own house.
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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Errm, yes and no. You could develop C#4 apps in Visual Studio 2005, but you won't get access to the features such as Intellisense, compile the application in the IDE or the ability to add references through the dialog. You'd end up with the IDE highlighting lots of things that it thought were wrong. But if you edited the .csproj file by hand, and triggered the compiler using csc.exe, then you could write the application in completely "the wrong" version of Visual Studio.
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Pete - thanks. It appears that the connection is so obvious its invisible. 2010 here I come.
Charlie Gilley
<italic>You're going to tell me what I want to know, or I'm going to beat you to death in your own house.
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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