Home > Unable To > Cannot Cast Dbnull To String

Cannot Cast Dbnull To String


Insults are not welcome. Can a countable number of intersections of subsets or their complements be the null set? A better line would be: if(row["fooColumn"] is DBNull) –doekman Jun 12 '09 at 8:30 @doekman - Actually, DBNull is a singleton class. If I bind "Checked" property of a checkbox to a SQL bit type field, and if SQL contains NULL value for that bit field, we dont get Exception, rather we see

May 18, 2006 09:27 AM|interwanderer1|LINK I'll give you a visual basic example. Thank you for using Infragistics Components. Browse other questions tagged c# asp.net database null or ask your own question. I logged in, but it shows we don't have any products registered. http://stackoverflow.com/questions/870697/unable-to-cast-object-of-type-system-dbnull-to-type-system-string

Unable To Cast Object Of Type 'system.dbnull' To Type 'system.string'. C#

This would be something like: string value = ( from row in ds.Tables[0].Rows select row.Field(0) ).FirstOrDefault(); share|improve this answer answered Aug 25 '08 at 20:47 Keith 67.2k39185293 2 +1: this It is very usual that I may have NULL values for some of the records in my SQL database and I want to use this control right a way to show Anyone know what it is? Take care.

It's quick & easy. Here is my next problem now. Cheers, Stefan Delmarco http://www.fotia.co.uk Hello Robert, From the code snippet it looks like you're using a strongly typed data set. Unable To Cast Object Of Type System Dbnull To Type System Byte Vb Net I just saw this bird outside my apartment.

PROBLEM User deletes value in the "Rider" cell, tabs out, and receives the following error (image attached as well) - "Unable to update the data value: Object of type 'System.DBNull' cannot Convert 'System.DBNull' to type 'System.String' ? Storage of a material that passes through non-living matter n-dimensional circles! http://stackoverflow.com/questions/26809/what-is-the-best-way-to-deal-with-dbnulls WinGridCustomDataRowEdit.zip Reply Post Points: 25 [Infragistics]Hristo Points 48,496 Replied On: Wed, Dec 7 2011 9:37 AM Reply Hello, ­­­­­ I am just checking about the progress of this issue.

Reply triggered Contributor 2255 Points 1043 Posts Re: Unable to cast object of type 'System.DBNull' to type 'System.Byte[]'. Dbnull In C# Example learn more about me at: mashitup .one of my (older) projects social tomorrow and Reply PeterLarsson None 0 Points 28 Posts Re: Convert 'System.DBNull' to type 'System.String' ? more hot questions lang-cs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science Other How is it packed?

The Value For Column In Table Is Dbnull C#

Terms of Service Layout: fixed | fluid CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100 418,751 Members | 979 Online Join Now login Ask More information here: http://msdn2.microsoft.com/en-us/lib...az(vs.71).aspx Cheers, Stefan Delmarco http://www.fotia.co.ukHI Stefan,Thanks for your reply.I tried that, as in:string dbnString;dbnString = cuser.FirstName.ToString();But still get the error:- cuser.FirstName.ToString() 'this.cuser.FirstName' threw anexception oftype 'System.Data.StrongTypingException' string{System.Data.StrongTypingException}I'm new Unable To Cast Object Of Type 'system.dbnull' To Type 'system.string'. C# I was assuming you were iterating over an IDataReader. Unable To Cast Object Of Type 'system.dbnull' To Type 'system.byte ' RSS 13 replies Last post May 23, 2006 07:41 AM by NC01 ‹ Previous Thread|Next Thread › Print Share Twitter Facebook Email Shortcuts Active Threads Unanswered Threads Unresolved Threads Support Options

Actually, I was confused and I thought, may be I could do something within my sourcecode which could check the NULL value for the databound property. Is it possible to post a small sample where your issue is reproducible in order to investigate this further for you. There is also row.SetField("column_name", value) for writing value to row. –Pavel Hodek Dec 19 '12 at 23:20 add a comment| up vote 4 down vote If you have control of the It is quite simple to do it but it would add some overhead especially if you are dealing with large DataTables. Cannot Implicitly Convert Type 'system.dbnull' To 'string'

Now, I have varbinary(Max) type of field in my SQL Database and I have used SQLDataSource and bound this varbinary(Max) field with the property BinaryData (byte[]) of my control. I will however stress that nullable types is the better route to go if you can use them. This will work, but not recommended. Here are some examples to deal with this scenerio.

What is the simplest way to put some text at the beginning of a line and to put some text at the center of the same line? Convert.tostring Dbnull http://msdn.microsoft.com/en-us/library/Aa479341.aspx Reply Hapani Ankit... in the above text your value is in the "whateverstringordatabasevalueyouwant" string...

Post your question and get tips & solutions from a community of 418,751 IT Pros & Developers.

Aug 13, 2007 11:05 PM|emran834|LINK Dear Ryan, Thanks a lot for your reply. If the WHERE does not match any row, you'll get a null, if the selected row has NULL in that column, the return value is System.DBNull. –Alexander May 27 '14 at Word for "using technology inappropriately"? System.dbnull Check Product , SNO ,BTCH Expiry ,QTY ,RATE and Amount.

Are 14 and 21 the only "interesting" numbers? Depalindromize this string! Your class really should have all this handled behind the scenes and act as a interface to the user. DataRowView0Unable to cast object of type 'System.DBNull' to type 'System.String' WHEN NOT CONNECTING AS ROOT1Transformation: Unable to cast object of type 'System.DBNull' to type 'System.String'0System.InvalidCastException: Unable to cast object of type

Sincerely,HristoDeveloper Support EngineerInfragistics, Inc. May 19, 2006 02:48 PM|NC01|LINK string textValue = string.Empty; object sessionObject = c.spCartListSmall(Session.SessionID); if ( (sessionObject != DBNull.Value) && (sessionObject != null) && (sessionObject.ToString().Trim().Length > 0) ) textValue = sessionObject.ToString().Trim(); lblBasket.Text Now, within my code, i have the property of byte[] type. public static PartOrder findPartOrder(string orderNo) { PartOrder aPartOrder = new PartOrder(); OleDbDataAdapter myAdapter = new OleDbDataAdapter(); if (aConnection.State == ConnectionState.Closed) aConnection.Open(); OleDbCommand cmd = aConnection.CreateCommand(); OleDbDataReader dbReader = null; cmd.CommandText =

How can I convert that to asystem.stingThanksRobert Dec 2 '06 #6 P: n/a Stefan Delmarco I should have added, there are 3 ways to configure your typed dataset's handling of null Why is this C++ code faster than my hand-written assembly for testing the Collatz conjecture? I would recommend creating your own class that generates a list of objects you need from an internal constructor where you can handle this with the SqlReader. Recommended read share|improve this answer answered Oct 4 '12 at 11:20 NeverHopeless 7,26941942 add a comment| up vote 0 down vote If you are concerned with getting DBNull when expecting strings,

I checked the ClaimItem object and the Rider property is a string. If the item is null or DBNull.Value, it will return an empty String. Solution 1 Accept Solution Reject Solution It is a quite common problem, because DBNull and Null basically mean the same, but are not the same type. string.Empty; The 'as' operator returns null for invalid cast's, like DBNull to string, and the '??' returns the term to the right of the expression if the first is null.

Regards, Peter Larsson Reply rumbafum Member 390 Points 247 Posts Re: Convert 'System.DBNull' to type 'System.String' ? The code is as follows: private void GetCartSmall(string sSessionID) { Cart2 c = (Cart2)WrapFactory.Create(typeof(Cart2)); SqlConnection conn = new SqlConnection(db.strConn); c.Connection = conn; lblBasket.Text = Convert.ToString(c.spCartListSmall(Session.SessionID));