DataSource Controls :: Passing Null To An Integer?
May 3, 2010i have some problem in passing null value to an integer datatype in sql. Here is my code:-
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The if statement within query is where i am having problem!
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DataSource Controls :: Passing NULL Dates Through A Property?
Jan 11, 2011Where do I validate my date values prior to passing them as insert programs ?
I am trying to pass some Null dates.
In my property ?
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DataSource Controls :: Passing Null To Storedprocedure Using Linq
Mar 31, 2010I have a SP db.sp_GetProfitMatrix , it takes nullable integer parameters, for which I have a default . It refuses me when I try to pass a null value (the two date parameters are nullable in the Linq designer) I get {"Nullable object must have a value."} error. here is my code:
int? nlDt = null;
var pms =
from p
in db.sp_GetProfitMatrix( nlDt.Value, nlDt.Value)
select
new
{
p.Volume,
p.GrossSales,
p.NetSales,
p.COGS
};
DataSource Controls :: Passing Null Value To A Decimal Datatupe Field?
Jun 16, 2010I have req where i have to pass null value,if value coming from db is null.Problem here is the field datatype is 'Decimal' so all the time even though value is null ,its passing as zero.How can I pass a null value to decimal field in C#.
FieldValue = (reader["Field"] ==
DBNull.Value) ?
Convert.ToDecimal(null) :
Convert.ToDecimal(reader["field"]);
What I want is ,Field value will get null value assigned not zero.
DataSource Controls :: Passing Null Values For Date Column In C#?
Jul 7, 2010I have req where i have to check the value coming from db is null or not and assign value according to that.Problem here is the field datatype is 'Datetime' so all the time when I tried to use the below line of code its giving me error.How can I pass a null value to datetimefield if value coming from db is null.
(reader["FieldName"] == DBNull.Value) ? string.Empty : (DateTime?)(reader["FieldName"]);
I came to know that string.empty is making problem,what value we can pass instead of string.empty for a datetime column in C#.
What I want is ,Field value will get null value assigned not zero.
DataSource Controls :: Get Last Row With Integer
Feb 12, 2010Using vb.net,asp.net 1.1,sql server Sorry about the Subject Line didn't quite know what to put in it. My problem is i'm making an RSS feed and I need to get the last question in my table. I have a SPROC already that I can get any question that I want by questionID Here is a some of the code:
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The questionID is Primary 1,1 so what I need to know is do I have to write another SPROC or can I get the highest number row or last row throught the value. For instance,
Dim myLastRow as Integer = What? Then for (ByVal questionID As Integer) I would myLastRow)
Insert Null Value Into Integer Field
Jan 28, 2010how can insert null value into integer field
View 3 RepliesDataSource Controls :: Select An Integer Value And Then Pad It With Blanks?
Jul 6, 2010I am reading an integer named "CostIndex" from a database table.I need to cast it to an integer and then pad the result withleading zeroes.So if CostIndex is only one digit then I need to pad it with 3 leading
blanks: 0007I know how to find the length, using LEN,but I don't know what to do beyond that? select CAST(CostIndex AS VARCHAR(4)) from TableRoot
Avoid Error Message Due To Null Vs Integer Incompatibility
Sep 26, 2010I receive the error message below, I think because the database field in question is null (I realize I probably should not allow null values, but I can't even display the page to allow the user to enter a value---and I would prefer not to enter a default value in SQL).
How do I avoid this error message? If the column is null (and it is supposed to be an integer), do I need to change the value to something like "0" in the code behind---or is there any easier way to do this right in aspx page (see source of error message below)? Either way, I'm not sure how to do either (I can't get any such lines of code to work here). 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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Web Forms :: Tableadapter Doesn't Allow Null Integer Columns?
Mar 29, 2010I have an sproc which selects data out of my table. The column can return integer or NULLs.
I get the 'failed to enable constraints error' when databinding. If I go to my tableadapter and select my column there is a NullValue property which has 'Throw Exception, Null, Empty'. If I try and unset the exception option it tells me only strings are allowed this. However the 'AllowDBNull' option is set to TRUE.
What is the alternative and will this be fixed in 2010?
DataSource Controls :: Changing Paramter Type Of Integer To String?
May 20, 2010How 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))
DataSource Controls :: Converting String To Integer For Inserting In SQL Database
Jan 28, 2010I have a stringvariabel in a form I shall insert in a SQL database in a integer field. I try to convert it in the parameterlist:
myComm.Parameters.Add("@UtstyrID",
SqlDbType.Int).Value =
Convert.ToInt32(e.Record["UtstyrID)"]);
but it only store the value 0 and not the value of the e.Record["UtstyrID)"])
DataSource Controls :: How To Pass Integer Data Type To Store Proc
Jan 1, 2011I have int datatype declared in my store proc.
When I try to pass parameter from code behind in sqldatasource as :
SqlDataSource3.SelectParameters.Add(ContactNum",
System.TypeCode.Int32,
"1")
I get error "
Error converting data type nvarchar to int. "
SQL Server :: Add Only Homework1(h1) For Specific Student Number - Convert Null Values To Integer?
Jan 25, 2011i have atable:
STDNo nvarchar(6) //student number primary
CID nvarchar(7) //course ID primary
DNo int //Department Number primary
H1 int allow null // Home work 1
H2 int allow null
H3 int allow null
H4 int allow null
H5 int allow null
Q1 int allow null //Quize 1
Q2 int allow null
Q3 int allow null
Q4 int allow null
Q5 int allow null
HE1 int allow null
HE2 int allow null
FExam int allow null // Final Exam
and stored procedure like this:
ALTER procedure [dbo].[AddMonthlyMarks]
(
@STDNo nvarchar(6),
@CID nvarchar(7),
@Dno int =isnull,
@H1 int,
@H2 int,..........................
the Data key name of grid is STDNo the problem is that the instructor this month will add only homework1(h1) for specific student number or to all students and rest of home works and quezies will not entered (Null), to the next month he will enter home work 2 ,etc... i get an error and i think that the null values for others home works in grid make this error caution: in table i check allow null property,the data type is integer How i can convert this null values to integer?
Forms Data Controls :: Passing Null Values To ObjectDataSource
Jan 4, 2011This is an ASP.NET 3.5 web app written in C# using VS2008 and connecting to an MS SQL backend. It is using ad hoc queries in a strongly typed dataset to pull from the database. This query (shortened for clarity) is designed to allow optional input of parameters (a requirement) or pull all records if no parameters are input. It works normally in SQL Server Management Studio with the addition of Declare and Set statements and it works normally in the TableAdapter's Query Builder:
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The markup contains this ObjectDataSource, which is tied to the TableAdapter with the above query:
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The problem I'm having is in passing null values to the ODS to feed to the query. Tying the ODS parameters directly to the dropdownlists and textboxes didn't work. Got an error message that there was a mismatched data type. Tried several combinations of code to feed the right values to the ODS parameters but couldn't find one that worked. Is the problem in the query or am I setting up the code-behind wrong? Here's the code:
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Forms Data Controls :: Compare Integer Value To Primary Keys Of A Detailsvew Datasource?
Mar 8, 2010I have a textbox that takes an integer value, and a submit button that when clicked passes the value to a detailsview to display the database record at that index.
What I'd like to do is, when the button is clicked, compare the number to the keys in the detailsview's datasource so that if the record ID doesn't exist, I can display a label telling the user that the ID# doesn't exist.
How would I go about doing this? Is there some sort of compare method for the datakeynames property?
DataSource Controls :: Passing Parameter To Datasource In Code Behind?
Mar 25, 2010I need to pass the control parameter to Sql Datasource in code behind,
<asp:ControlParameter ControlID="DDL_RType" Name="rtype" PropertyName="SelectedValue"
DataSource Controls :: Use Is Null In Query Without Using Parameters For It Or Should Use Parameters For This Field Where Value Is NULL
Jan 21, 2010here is my code for selectiong some records from db table
string strSql = "select * from mtblNBD where SentTo=@SentTo and InternalStatus Is NULL order by DeadLine desc";
SqlCommand com = new SqlCommand(strSql, con);
com.Parameters.Add("@SentTo", SqlDbType.NVarChar, 50).Value = (string)Session["uname"];
here I am using parameters for SenTo field but not for NULL so it is ok... or should I use parameters for this field where value is NULL , if yes then how can I use parameter for this
DataSource Controls :: Null Datasource - Forward To New Page
Jan 19, 2010I have page that has a datasource. The datasource executes a stored procedure and returns results. If the result is NULL, I'd like to forward the user to an error page. How would I accomplish this with ASP.NET and C#?
View 1 RepliesDataSource Controls :: Conversion From Type 'DBNull' To Type 'Integer' Is Not Valid?
Jan 22, 2010I 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?
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Passing Null Or Zero Length String?
Jul 29, 2010Passing onto a stored procedure a value from a GridView. The particular fields are a date type, and numeric type. Problem is, its plausible and conceivable in this case one or both could be null or empty.
Through searching I've seen suggested such ideas as Convert.ToDate(value), CDate(value), and so on.
None of these work. You cannot convert an empty string or null value to a date. I don't know about the numeric value.
So, barring any non-working examples already given. What is standard. Its not like I've stumbled across some never afore seen problem.
Here is my code, but its quite typical.
Dim txtctlHireDate As TextBox = CType(gvEvaluatees.Rows(e.RowIndex).FindControl("txtHireDate"), TextBox)
Dim txtctlGradYear As TextBox = CType(gvEvaluatees.Rows(e.RowIndex).FindControl("txtGradYear"), TextBox)
Dim txtctlBU As TextBox = CType(gvEvaluatees.Rows(e.RowIndex).FindControl("txtBU"), TextBox)
Dim ddlctlEvalGroups As DropDownList = CType(gvEvaluatees.Rows(e.RowIndex).FindControl("ddlEvalGroupSelection"), DropDownList)
Dim chkctlActive As CheckBox = CType(gvEvaluatees.Rows(e.RowIndex).FindControl("chkActive"), CheckBox)
UpdateEvaluatees.MGEvalUpdateEvaluatee(gvEvaluatees.DataKeys(0).Value, txtctlHireDate.Text,
txtctlGradYear.Text, txtctlBU.Text,ddlctlEvalGroups.SelectedValue, chkctlActive.Checked)
gvEvaluatees.EditIndex = -1
gvEvaluatees.DataSource = EvaluateesForDataGrid.GetData
gvEvaluatees.DataBind()
I've bolded the parameters in question. A date value and numeric value are expected.
DataSource Controls :: Passing Connection By Ref?
Mar 15, 2010Issues with the below code. I feel something wrong here. Advisable to use or recode? below is my connection pooling class.
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i create new connection and close the it by passing its reference as below in finally block.
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VS 2005 Passing Textbox Values To SQL (not Null)?
May 7, 2010Code:
SELECT one, two, three, four FROM tblFixedLine_onenet_callLog WHERE (one LIKE '%' + ISNULL(@one,'') + '%') AND (two LIKE '%' + ISNULL(@two, '') + '%') AND (three LIKE '%' + ISNULL(@three, '') + '%') AND (four LIKE '%' + ISNULL(@four, '') + '%') ORDER BY one, two, three, four
@one, @two, @three and @four are textboxes on my ASP.NET page all of which by default have no value(therefore i assumed NULL).If i test the SQL in the VS2005 SQL Configuration (and put the values in manually) it works but the ASP page returns no results... i assume therefore the Textbox value is "" not Null.
DataSource Controls :: Passing A Variable In A SelectCommand?
Jul 7, 2010I am trying to pass a variable within a selectcommand statment in ASP.NET and I have researched online how to do it but I can't seem to find a way to do it...What I am trying to do is write a code for a web page that will display a page with useful links on it where the links are separated into different topics and where everything is dynamically grabbed from a database. This is what I have so far:
<!-- Start MainContentRegion -->
<h1>Useful Links</h1>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
[]code...
DataSource Controls :: Passing Parameters To ObjectDataSource
Aug 9, 2010I followd Brian Orrell LINQ tutorial for paging/sorting and created a gridview bound to an ObjectDataSource through a method call which gets data from adatabase. My form includes two buttons with a textbox next to each one of them. I need to be able to populatte th egridview depending on the button that was pressed, I cannot figure out how signal my method which button was pressed.
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