im getting a value from the database. it came out an error saying "Conversion from DBNULL to Double is not Valid."
Public Function Total() As Double
Dim Total As Double
Dim strConn As String
strConn = ConfigurationManager.ConnectionStrings("***").ToString
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im getting a value from the database. it came out an error saying "Conversion from DBNULL to Double is not Valid." anyone,
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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.
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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 wanna convert char to double type and convert it to date.char->double then double -> date type.I have a whole string and i trim it into 3 parts. In my item(2) is a UNIX Timestamp i'm trying to convert it into date type.
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i have a strange error creaping into my web app but am unsure as to how to fix it. When i run this code on my debug workstation it works fine but when i transfer it to my server things seam to go wrong.
dev station (windows 7) + VS2010
regional and language settings all set to uk
server (windows 2008r2)
regional and language settings all set to uk
What seams to be happening is that when converting a string to a double it works correctly on the dev environment but moves the decimal place to the end on the server.
example code(vb)
dim lat as string = "52.983829"
dim long as string = "-0.036500"
dim latint as double = lat
dim longint as double = long
now on the dev server the value of latint is 52.983829 as you might expect but on when published to the server it becomes 52983829.0 the same with longint on the dev staion it is -0.036500 but on the server it becomes -36500.0 i get equally confusing problems if i try to change it to an integer instead.
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I have one gridview footer template textbox and asp.net textbox. Here i need to check bothe textbox value are equal in if statement. How to convert both textbox in double and use in if statement to check.
I'm using linq to sql,everything seems to be working fine except one thing,I'm showing any mapped float fields from my db tables as "Double?" instead of "Double", and when binding to a datagrid, any of those "Double?"fields don't show.If I iterate through the items and spit out the property,the float value is indeed there and properly returned.
View 3 Repliesis both same
View 1 Repliesi would like to show an image if the record is not activated (SQL inaktiv(bit)=1)
Here is the script code in my aspx-site. An error is displayed in this row: ...
I have a question, that probably the solution is very simple, but I looked it up in the internet with no answer, the problem I'm having is, in a table I have a field, Qty (int, null) the thing that I want is in the report if the value is NULL shows 1 instead of a blank textbox, I know that the best solution is to change all the values in the database but I don't have permissions to do that, so what I need to do is a workaround in the report.
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I have tried different ways. ... How do I test my integer column for DBNull?
I tried
If IsDBNull(Advlnk.RMTest)
Then
Response.Write(
"this is null")
and this doesn't work either.
I have an optional DropDownList. If the user dosen't select any value the top most value is "0" unfortunatly the only way to send DBnull.Value to the database is check if the value is 0 and if it is then send dbnull. Is there a way you can do this within the dropdownlist without having to check for each and every dropdown?
View 5 RepliesI am trying to do an update and if no selection has been made in a dropdownlist (integer) or date field I would like to insert a dbnull value. But I am new to Linq to Sql and wonder if this is possible and if so how to process. I have the following code but the DBNull.Value is giving me an error.
Dim context As New SondageDataContext()
Dim repondant = (From r In context.Repondants Where r.RefRepondant = iRefRepondant Select r).Single
repondant.Prenom = strPrenom
repondant.Nom = strNom
'dates
If dtAdhesion > Date.MinValue Then
repondant.DateAdhesion = dtAdhesion
else
repondant.DateAdhesion = DBNull.Value
End If
'Integer for dropdownmenu
If iOccupation <> -1 Then
repondant.RefOccupation = iOccupation
Else
repondant.RefOccupation = DBNull.Value
End If
context.SubmitChanges()
I need to pass DBNull to a table adapter expecting int, the solution listed below does not work,
int NetID = DBNull.Value;
This has never happened before. It is not happening even in my visual studio. It is only happening on the live site. This never happened before on the live site either. I changed the master template but the change I made had nothing to do with the issue here. 3
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Exception Details: System.InvalidCastException: Conversion from type 'DBNull' to type 'Integer' is not valid.Source Error:
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Line 25: <asp:DataList ID="DataList1" runat="server" DataKeyField="AParentID" DataSourceID="ObjectDataSource1" RepeatColumns="2" ShowFooter="False" ShowHeader="False" Font-Bold="False" Font-Italic="False" Font-Overline="False" Font-Strikeout="False" Font-Underline="False" HorizontalAlign="Center" CellSpacing="0" CellPadding="0" ItemStyle-Width="225" Width="500px">
Line 26: <ItemTemplate>
Line 27: <asp:Image ID="Image1" runat="server" ImageAlign="NotSet" ImageUrl='<%# GetImage(Eval("AParentID")).ToString %>' />
Line 28: <asp:HyperLink ID="HyperLink1" runat="server" Text='<%# Indent(Eval("ACategory")).ToString() %>' NavigateUrl='<%# String.Format("articles_view_subcats.aspx?catid={0}",DataBinder.Eval(Container.DataItem,"ACategoryID")) %>' ForeColor='<%# GetFont(Convert.ToInt32(Eval("AParentID")))%>' Font-Size='<%# GetFontSize(Convert.ToInt32(Eval("AParentID"))) %>'></asp:HyperLink>
Line 29:
here's my code...
select SUM(PETTYAMOUNT) AS tot FROM FINPETTY WHERE PETTYAMOUNT IS NOT NULL AND CENTER = '1'
if (drReadera.HasRows)
{
double totamta = Convert.ToDouble(drReadera["TOTALSUMA"]);
Label2.Text = String.Format("{0:N2}", totamta);
}
note: some of the pettyamount is null that's why i've got an error in page.
Case "System.Int32"
Return Convert.ToInt32(a) + Convert.ToInt32(b)
Object cannot be cast from DBNull to other types
here's my error...
Exception Details: System.InvalidCastException: Object cannot be cast from DBNull to other types.
here's my code.
double totald = Convert.ToDouble(drReaderdeduc["TAMT"]);
totaldeduc.Text = String.Format("{0:N2}", totald);
the problem is the query output is null but i convert.todouble so got an error... what is the best solution if the record is null?
<%# Eval("Description") == DBNull.Value ? "empty" : "notempty"%>
is showing always 'notempty' even there is null in that field in DB (type of varchar(), null)...
Tried also checking for empty string:
<%# Eval("Description") == "" ? "empty" : "notempty"%>
and it always displays notempty... what's wrong here??
I'm building an application that uses GridView controls to display data to a page.In my editemplate i have following control
<div class = "divBox">
<div>Beginn/Zeit 2</div>
<div>
<asp:TextBox ID="tbBeginn2" CssClass="fSelect"
runat="server" Text='<%# Bind("beginnDatum2") %>'/>
BeginnDatum2 has datetime-Format in SQL-Server.
For the update i use an objectDatasource with following updateparameter
<asp:Parameter Name="beginnDatum2" Type="datetime" />
Now i'm trying to update this field but i have a problem when BeginnDatum2 must be null.
I get following (german) Errormessage:
SqlDateTime-Überlauf; muss zwischen 1/1/1753 12:00:00 AM und 12/31/9999 11:59:59 PM liegen.
And this is my paramter
Public Function UpdateSeminar(ByVal kursid As Integer, ByVal id As Integer, _
ByVal beginnDatum2 As DateTime, _
ByVal endeDatum2 As DateTime, _
cmd.Parameters.Add(New SqlParameter("@beginnDatum2", SqlDbType.DateTime))
If beginnDatum2 = Nothing Then
cmd.Parameters("@beginnDatum2").Value = DBNull.Value
Else
cmd.Parameters("@beginnDatum2").Value = DateTime.Parse(beginnDatum2)
End If
I have a webpage, i have a usercontrol in it , its name ispersonal1, i have tow Radiobutton in this usercontrol, the id of one of them ismale and the other one is female, it is obviously that each time we fill one of these radiobuttons and the other one will be null,in my database the type of these fields are bit , and they have allow null, i defined a property for my usercontrol like this:
public bool male
{
get
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My database includes a table with sever filds which are defined as (varchar(1),null), I tried using DBNull.Value, null, ' ' but cannot get a null inserted in that field of the database,
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Object cannot be cast from DBNull to other types. 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.InvalidCastException: Object cannot be cast from DBNull to other types. Source Error:
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Line 292:
Line 293: If DataBinder.Eval(e.Row.DataItem, "Casette") IsNot Nothing Then
Line 294: stcassette += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "Casette"))
Line 295: End If
Line 296:
I have a recordset in a gridview that comes from an outer joint that creates null values in the recordsetWhen I write to the database using stored proc defined in datasource I get dbnull error.I'm trying to process the onDeleting event in the code behind but don't know what to write or if that's the best wayI need to call a stored proc and if the last parameters value is null then the stored proc does one thing, if it's no null it does something else.However DBNull doesn't ssem to be working.
View 1 RepliesThere are two dropdowns for date (Fromdate and Todate) in my webpage and by default when the page loads for the first time the dropdowns loads with the last date (currentdate), if I select some previous date in Fromdate dropdown and reload the page then it displays runtime i.e.
Object cannot be cast from DBNull to other types.
Following code is written under GridView RowDataBound Event.
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The error found at following line:
less7daysTotal += Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "less7days"))
If I comment this line then the error moves to next line till following line.
grt28daysTotal += Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "grt28days"))
I fruther want to inform that some columns in the grid are showing 0 if there is no record but I replaced 0 to - then some 0s replaced and some not. What is the reason?