DataSource Controls :: Conversion From Type 'DBNull' To Type 'Integer' Is Not Valid?
Jan 22, 2010
I get the error - Conversion from type 'DBNull' to type 'Integer' is not valid. - on the line.....
Dim newid As Integer = e.Command.Parameters("@latestRowId").Value.........in vb code behind.
I have the identical code for another page with the exception of the field names and it works fine. The only thing I did differently, as far as I know, is I copied the asp and code behind from the page that works into this page and manually changed the field and table names. I don't know what the problem is. Does anyone see any problems?
I have a gridview which I'm trying to get the display of phonenumbers listed in a certain display format; (xxx) xxx-xxxx.If I have the code such as this, it displays the unformatted phone number and (000) 000-0000 for the null items.
Conversion from type 'DBNull' to type 'String' is not valid
Dim OledbString As String = ("SELECT Product_Hierarchy,Model,Origin,Item_Code,Description,Price_USD FROM [sheet1$]") 'Dim eAdapter As New SqlDataAdapter(sqlString, connection) Dim eAdapter As New OleDbDataAdapter(OledbString, connection) Dim eTable As New DataTable() eAdapter.Fill(eTable) Dim i As Integer = 0 [code]...
I have a web in ASP.NET AND CODE IN VB MY DATABASE IS ACCESS WHICH WAS CREATED INITIALLY AND OLD DATA IS ACCESSED FROM THIS ACCESS DATABASE.
THE PROBLEM IS WHEN THE FIELD IS BLANK THE FOLLOWING ERROR COMES
Conversion from type 'DBNull' to type 'String' is not valid.
MY CODE IS AS UNDER
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click Dim PNO As String = inputtxt.Text Dim connectString As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _ "Data Source=C:awingAWing.mdb" Dim con As OleDbConnection = New OleDbConnection(connectString) con.Open() Dim qstr As String qstr = "select * from PersData where PNO='" + inputtxt.Text + "'"
Im receiving a strange error Error Message: Conversion from string "15/08/2010 22:21:35" to type 'Date' is not valid.
I know this is generally down to cultural date formats etc, however the reason this is strange is it just randomly occured twice in the last week, the website has been running since october and nothing has changed,
The error constantly occured until the IIS was reset and recompilled the site, its been running fine since, however im just trying to figure out what could cause such an error to occur.
This code works somewhat, but it won't place all of the text into the textbox.. If I change a few things I get an error where I highlighted the code in red. Conversion from string "" to type 'Double' is not valid. But the code works, like I said somewhat, as you see it, it just doesn't load all of the text to the text box.555632.txt
Code: Public Class Form1 Private Sub OpenFile_Click(sender As Object, e As EventArgs) Handles OpenFile.Click Dim IdxList As String Dim ProgArray() As String Dim Index() As String
Basically, what I did is that: I have a table in SQL database and some of data fields allow null. I built Objectdatasource through dataset. When I built update page using dataset. It generate the following error before showing the update page correctly. It seems I have issue to retrieve the null value from the database through using objectdatasource through dataset. Any suggestions?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
How can I change the parameter value from Interger to String. Here below is the part of the code that creates problem; the constant "sqlStatement" is as string, but when the parameters "@ProdColor" read the value it returns an integer instead of the proper type which is a string. I have tried every ting like: CType(sqlStatement(splitItems(1)), string) Or convert or parse, but it keeps returning the wrong type.
Const sqlStatement As String = "INSERT INTO ProductDetails (ProdID,ProdColor,ProdSize) VALUES" If item.Contains(",") Then splitItems = item.Split(",".ToCharArray) cmd.Parameters.AddWithValue("@ProdID", SqlDBType.Int).Value = sqlStatement(splitItems(0)) cmd.Parameters.AddWithValue("@ProdColor", SqlDBType.NVarchar).Value = sqlStatement(splitItems(1)) cmd.Parameters.AddWithValue("@ProdSize", SqlDBType.NVarchar).Value = sqlStatement(splitItems(2))
I seem to be having issues with posting forms with DropDownLists. I've looked all over the net and tried various solutions, but none seem to work for me.
I'm getting the following error: The parameter conversion from type 'System.String' to type 'Models.Organization' failed because no type converter can convert between these types.
Here's my ViewModel:
Here's my controller:
The objects are generated by ADO.NET Entity Framework. Organizations is its own object, but also a property of Profile (each user belongs to one organization). Now I understand what the error message is saying, just not sure how else I'm supposed to do this.
I am a newbie in ASP.NET. I am facing this problem. I need to insert data into my database, where is primary key uniqueidentifier. I am using FormView and if I insert data there is an error. In asp:Parameter there is no datatype, which is support uniqueidentifier.
I get this error when I am trying to concatenate the two fields in bold into one field for a datagrid.
select count(cp.iOwnerID) as enrolled,(duration + '' + duration_interval) AS Duration ,session_id,school_id as SchoolId,program_id as ProgramId,convert(nvarchar(10),session_start_date,101) as SessionStartDate, session_class_size as SessionClassSize from dbo.cnSchoolProgramSessions cn with (nolock) left join customerproduct cp on convert(datetime,convert(nvarchar(10),session_start_date,101)) = convert(datetime,convert(nvarchar(10),cp.dtPurchasedate,101)) where record_status = 1 and school_id = '" & iSchool & "' and program_id = '" & iProgram & "' and (CP.chProductNumber = '" & Me.Label5.Text & "' or CP.chProductNumber IS NULL) group by session_id, school_id, program_id,session_start_date,session_class_size,duration,duration_interval
I am LINQ querrying against a datatable. However, I am unsuccessfull with catching null values. Here is my code that is giving me the following error.
I am checking to see if minperc is null. However to check that it still is trying to convert the value to double. Cant figure out a way around it. Here is the error: Cannot cast DBNull.Value to type 'System.Double'. Please use a nullable type.
I keep getting this error when attempting to execute this code, even after placing a CType around the value and defining it as double?Private Sub GridView1_RowDeleting(sender As Object, e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles GridView1.RowDeleting' The deletion of the individual row is automatically handled by the GridView.
I have a variable that contains an integer which I then want to save as the value for a column (of type integer in the sql database and int32 in the entity model), but when I try this I receive the error:
"Conversion from string "" to type 'Double' is not valid"
I'm very confused by this since I'm not using a string or a double? The trouble-making line is:
UpdateBed.First.occupant = GetID
And here is the full code snippet:
Private Sub btnReserve_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnReserve.Click Using dbContext As pbu_housingEntities = New pbu_housingEntities ' Check that the room is still available.
Dim hall As String = CStr(Session("hall")) Dim room As String = CStr(Session("room")) Dim checkOccupants = From p In dbContext.Rooms [code]....
I have a SQL which is running good at SQL Server Mgm studio:
"select d.EmployeeID, CONVERT(VARCHAR(10),d.LogTime,111) as Date1, MIN(CONVERT(VARCHAR(8), d.LogTime, 108)) as FirstIn from LogTable d where d.dwStatus=0 group by d.EmployeeID, CONVERT(VARCHAR(10), d.LogTime,111)"
However, When i put it into my code (Entity SQL):
"select d.EmployeeID, CONVERT(VARCHAR(10),d.LogTime,111) as Date1, MIN(CONVERT(VARCHAR(8), d.LogTime, 108)) as FirstIn from IGPSiteEntities.AccessLogSet AS d where d.dwStatus=0 group by d.EmployeeID, CONVERT(VARCHAR(10), d.LogTime,111)"
I got error :
'CONVERT' cannot be resolved into a valid type of function. Near simple identifier, line1, column 200.
LogTime is a DateTime format e.g 05/05/2010 14:12:12
I want to select ONLY the Date (e.g 05/05/2010) and select ONLY the time (e.g 14:12:12) so i use CONVERT function.