DataSource Controls :: Passing Null Values For Date Column In C#?
Jul 7, 2010
I 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.
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Similar Messages:
Jan 19, 2010
i dont know why this happens and when happens......i have one employee table that contain date field and that field contain two different values one is -'2008-10-01 00:00:00.000' and second is '2008-10-01 12:00:00.000'.can anyone explain when this type of value insert in database.
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Jul 5, 2010
I am very new to ASP .NET and am getting above error when trying to insert a new record into a SQL database. I have turned on Option Explicit On so the default date of 01/01/1900 does not get assigned to this field automatically. Since most of the people in the database will not have a date of death, I need to have "blank" deathDate. When I run the stored procedure within SQL and choose pass null value, the Insert Procedure works fine. When I attach to Web Form, however, I get String was not recognized as a valid DateTime error. How can I set it so Null values are accepted into this date field.
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Dec 30, 2010
I have gridviwe having 2 columns:
1) DocNumber 2)Title
query select docnumber,title from tbl_docs.
BindwithGridviwe(sql);
Now the issue is that that every document doesn't has document number. I want to make invisible the docuNumber column of the grid viwe if all values in the docNumber retrieved are null.for example:
docnumber tite
null Document 1
null Document 2
null doucment 3
null document 4
if returned result match above where all docnumber are null then make the gridviwe docnumber column ivisible eslemake the greidviwe column visible.
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Jan 4, 2011
This 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:
[Code]....
The markup contains this ObjectDataSource, which is tied to the TableAdapter with the above query:
[Code]....
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:
[Code]....
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May 3, 2010
i have some problem in passing null value to an integer datatype in sql. Here is my code:-
[Code]....
The if statement within query is where i am having problem!
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Jan 11, 2011
Where do I validate my date values prior to passing them as insert programs ?
I am trying to pass some Null dates.
In my property ?
[Code]....
[Code]....
[Code]....
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Mar 31, 2010
I 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
};
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Jun 16, 2010
I 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.
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Aug 10, 2010
I have a table converted from Access and the identity keys were lost. Now I need to make the id column the identity column, but it already has a lot of null values, how do I auto generate integer values for the null rows? The row ids are incremented, so if there is a way to auto increment the ids
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Mar 31, 2010
i have a datatable with several columns and rows. now i want to copy the last column fully (all rows) and create the new column with that values.
it means last column values sholud be moved to new column (now this is the last column).
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May 10, 2010
I have a requirement to store dates before 1753 in my SQL Server 2008 database and to update these from ASP.NET.
I have created my table column as a date datatype rather than datetime.
My stored procedure has a parameter defined as a date datatype.
However, I have to create the parameter in ASP.NET with a typecode of DateTime (since this is the only relevant type available) and it appears that SQL Server first validates that parameter as a datetime even though I have defined it as a date (exception returned to ASP.NET is 'SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM').
For avoidance of doubt, I can specify a value of e.g. '1/1/1716' in an update query in Management Studio. So it is just a matter of how I get it into the SP from ASP.NET. Surely Microsoft must have thought of this when inventing the new datatype?
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May 7, 2010
Code:
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.
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Apr 9, 2010
having a table with column having null values
how to identify row of a column contains null value?
i tried isnull,nullif properties but such functions im getting emptied rows
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Feb 12, 2010
ALTER procedure [dbo].[Sample2]
@Col as nvarchar(1000),
@Value as nvarchar(1000)
[code]...
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Oct 15, 2010
Just a fictional code, but why this won't work? (as the date variable is nullable)
DateTime? date = textBoxDate.Text != "" ? textBoxDate.Text : null;
The error is "There is no explicit conversion between System.DateTime and <null>
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Mar 8, 2010
i want to insert null in smalldatetime column, when user doesn't select any date from the calender control i want to insert null in the databse, i am using typed dataset in my application.
here's my code
[code]....
it gives me the exception "SqlDateTime overflow. Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM."
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Apr 8, 2010
how can i insert 'null' value in numeric column if no record is there.when i pass record to BLL like
MyCollegeAddmissionMst.GraduationYear = IIf(txtGrdyear.Text = String.Empty,
"", txtGrdyear.Text.Trim())
datatype is numeric(4,0) then error is Conversion from string "" to type 'Integer' is not valid. no record is in this textbox and i need to entry null value.so how can i do the same.
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Jan 6, 2010
How can i get the values even when the Source or url is null from the below query
SELECT a.id,
isnull((SELECT STUFF((SELECT
'<li><a href="'+url+'">'+Source_Name+'</a>
<span>(' + k.Source +')</span></li>' end
FROM table1 i, table2 k, table3 j where
i.CategoryID = j.Category_ID and i.CategoryID = c.Category_ID and i.Source = k.ID
FOR XML PATH('')),1, 0, '')), '') AS Source_url,
FROM @table4 c INNER JOIN table5 v
on c.Category_ID = v.Category_ID
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Feb 14, 2010
i want to pass null value into varbinary(max) column n to by table
if i do like this i have this function in my app_code .vb class
Public Function Remove_Attachment(ByVal Id As Integer) As Integer
Try
Dim db As New dbAccess
db.commandText = "SP_RemoveAtt_DML"
db.commandType = CommandType.StoredProcedure
db.addParameter("@InOutVal_Id", Id)
db.addParameter("@Document", System.Data.SqlTypes.SqlBinary.Null.Value)
db.executeQuery()
Catch ex As Exception
Throw ex
End Try
End Function
i got this error. Data is Null. This method or property cannot be called on Null values.
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Jul 28, 2010
I am passing values from textboxes on the webform to my stored procedures where it should insert values passed.
It is giving an error like Cannot implicitly convert type 'string' to 'System.Data.SqlClient.SqlParameter' at place where I am cmdselect.Parameters.Add("@PackageName", SqlDbType.VarChar, 50) = PN; where PN is string type .
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Feb 27, 2011
I am trying to pad for null values in the below code. Anybody know how to fix this error? Conversion from type 'DBNull' to type 'String' is not valid.
Dim dvUserImgPath As Data.DataView = CType(ImgPathDS.Select(DataSourceSelectArguments.Empty), Data.DataView)
Dim drUserImgPath As Data.DataRowView = dvUserImgPath.Item(0)
lblHiddenImgPath.Text = drUserImgPath.Item("ImgPath")
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Apr 22, 2010
I am trying to create a stored procedure where I can insert null values in columns that have a foreign key constraint and allow nulls. The columns I am trying to insert nulls into are commentid and imageid. I have created an Insert statement in a stored procedure and I get the foreign key constraint error. Can you tell me how to allow inserting data in the other columns without having to insert anything in the commendid and the imageid?
Here is my exec of the stored procedure that is not working:
[Code]....
[Code]....
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Sep 29, 2010
Scenario:
I am creating a custom gridview control which has a custom CheckBoxTemplateField column (deriving from TemplateField class). This template field column has custom Checkboxheadertemplate (implementing ITemplate) and CheckboxItemTemplate (also implementing ITemplate). In InstantiateIn method of both templates (header as well as Item template), I am adding a checkbox control which has Autopostback = true.
My requirement is:
I want to mark all the values in the binding column of datasource if checkbox in headertemplate is checked. I dont want to mark only rows visible on grid. I WANT TO MARK ALL ROWS IN DATASOURCE. I want to do this in _CheckedChanged event of checkbox in header template.
Problem I am facing: When I check/uncheck the checkbox in header, it postbacks. so in OnCheckedChanged event, gridview's datasource is null. Secondly, in any event of gridview, I could access only those rows of datasource for which corresponding rows are visible in gridview through Gridviewrow.DataItem property. But I want to set it for all rows in datasource.
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Feb 11, 2010
Is there a cleaner way to check for a null value comming from the database?
Right now i am doing this
[Code]....
There has to be a better what than doing this on every row which could possibly be null
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