VS 2010 Showing Null Dates In A DGV
Jul 21, 2010
I've got a DataGridView that has a column that will show dates/times this column needs to be sortable so I use this to tell the DGV that it is storing Date type objects (so that sorting works fine automatically):[code]Now the problem is that there will be some records shown in this DGV that do not have a value for this date column. How can I display this? If I dont set a value for that column or I set it to Nothing then the cell just shows the minimum date value (01/01/1601).Oh and this DGV is not using data binding if that makes any difference. Perhaps this might be a good time for me to investigate this data binding lark though if that will help with this issue? I'm sure I recall seeing something about being able to use one value but display another value when you use data binding thats all.
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Apr 18, 2011
I am reading dates from a table in a database to display in a DataGridView column that is formatted as a date. The problem is that when the value is null in the database my program errors out because it cant convert the value to a date. How do you guys handle this? *Edit: If I set the value of my date variable to "Nothing" it displays as "1/1/0001" in my DataGridView, and I would like the cell to be empty for the null dates.
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Dec 26, 2008
I am using Visual Basic 2008, and SQL Server 2005. I have a single-user client-server app (i know that sounds stupid, but its for future expandibility and also the fact that documentation was easier to find for SQL server than Access files).The app is basically a medicals records system.
In one of the tables, called 'visits', it stores the dates on which each patient visits the doctor, among other things like symptoms and diagnosis. Another table stores all the patient names and IDs along with other details, and a relation has been set up between the patient ID in the patients table and the visits table. So i dragged the visits table from within the patients table (to get only the visits for that particular patient), and dragged it onto the form to make a datagridview. However, the datagridview didn't seem to recognise MS SQL server's smalldatetime format, and tried representing it as a picture. When i changed the format of the column to text boxes, it gave me a type mismatch error (Inconvertible type mismatch between SourceColumn 'VisitDate' of DateTime and the DataColumn 'VisitDate' of Byte[].) That means, for some reason, it is trying to convert the smalldatetime data to byte before it shows it, which is leading to the error. How do i fix this?
Also, I remember seeing some option for using completely custom column types in the datagridview, but i cant seem to find it now. The options in 'Edit Columns' are very limited, but i would like to set it to a masked text box, or something with a fixed format. Can someone recommend a good column type for representing dates, and how to make the datagridview show that kinda column?
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Feb 7, 2012
I am trying to implement a function for my SSRS report which will return a color value depending on the values of three dates.
[Code]...
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Jul 7, 2009
I am using following code in rowdatabound fn.
Protected Sub gvwMileStone_RowDataBound(ByVal sender As System.Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs)
[code]...
ddlEProjectLevels is dropdownlist in edititemtemplate.Whwn i click edit in 1st row ddlEProjectLevels gets loaded with data from database.But in 2nd row dropdownlist does not contain values.Again in 3rd it gets loaded from db.Means in alternate rows,when i click edit dropdownlist(ddlEProjectLevels) doesnot load values.Can anybody help?
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Feb 15, 2012
Having problems with null dates in a mysql table. Have eventually found out that I can store a 'null' date in mysql as "0000-00-00" and I can run the 'insert' command to add a record to the mysql table. When I check on mysql workbench I can see the row has been inserted correctly and the date shows as "0000-00-00".However...When I try to load the table into a datagridview, I get an error = mysql Conversion Exception was unhandled = "Unable to convert MySQL date/time value to System.DateTime".
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Jun 30, 2011
I'm using some session variables to store and pass data across several pages of an ASP.Net application. The behavior is a bit unpredictable though. [Code] Ok so far so good, on a normal page load. If the user completes the form action, hits the next page, and decides OH NO, i needed to change field xyz, and clicks back, corrects the data, then submits, the session variable is showing as NULL. Why would a cached session behave this way? I'm not destroying/clearing the variable, unless I fail to understand the scope of session variables.
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May 31, 2012
I have a VB.NET application which runs perfectly with local host. But when I upload it to my server the session objects throw null reference exception.
Sessions is not working in a single page. If I use session on any other page it is working perfectly.
I have enabled session in that page using the EnableSessionState property. Also in web.config I enabled the use of session variables.
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May 17, 2012
Currently, the following code shows a blank line if Address2 (which comes from the database) is Null. How can I condition on the value of <%#Container.DataItem("Address2")%> so I can get rid of the blank line if Address2 does not exist (or is Null) in the database? If code in the code-behind is needed
<asp:repeater id="rptLabels" runat="server">
<HeaderTemplate></HeaderTemplate>
<ItemTemplate>
[Code]....
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May 27, 2012
y code below:
Function combobfill(ByVal table As String, ByVal field As String) As DataTable
addconnection.Open()
Dim selectstring As String = "select " + field.ToString() + " from " + table.ToString()
[code].....
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Jun 21, 2011
I am doing a comparison of the date in my db and the date in my datetimepicker.I am using the following
While reader.Read()
Me.dtpGeboorteDatum.Text <> reader("GeboorteDatum").ToString Then
The value of me.dtpGeboortedatum.text is "1-1-1900 0:00:00"
[code]....
How can I get both dates the same format so I can do the comparison?
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Jun 3, 2010
I need to calculate and display the date and time 1/2 way between 2 given dateTimes. On my form i have 3 DateTimePicker tools. here is my code on the button1 click event.[code]i have tried converting to ticks and then subtracting from the difference to no avail (read only property).
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Aug 1, 2011
I am trying to do a comparison between a date in my db and a date in a textbox.I am using the following
CDate(Me.txtVrijeDatum01.Text).Date <> CDate(reader("VrijDatumVeld01")).Date
It works pretty well except when the textbox is empty or the value in the db is NULL.
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Jun 14, 2011
For the past day or so, I have been trying to compare values in my SQL server against an actual calendar. I have had mixed luck with this and I have exhausted my limited knowledge. I am looking for a shove in the right direction.
Background:Right now, I have a program that writes a record to a database when the program completes successfully. This time stamp has both the date and time on the SQL box. I want to grab that information and compare it against the basic calendar. I have attached a picture that should help explain things. This is just my test app,
[Code]...
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Apr 5, 2012
I am trying to pull data that falls between two dates: I have a dataset that has the following SQL. This I have on my form as a DataGridView. I then have two DTPs that the user would use to select start and end dates.
SELECT JobNumber , DeliveryDate FROM vJobs WHERE (DeliveryDate BETWEEN ? AND ?)
When clicking a filter button I have the following code that refreshes the dataset and DataGridView
Me.VJobsTableAdapter.FillByFilter(Me.DsJobs.vJobs, dtpDateFrom.Value.Date, dtpDateto.Value.Date)
But no data is displayed
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Feb 20, 2010
I have two dates. [code] How to print all dates between these two dates in one listbox, for example: [code]
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Aug 5, 2011
have a table in SQL Server Ex 2005 containing a column called "geboortedatum" (datetime)When I open the table the date is shown like this: "31-12-2011 0:00:00".When I use the query designer and execute the query select geboortedatum from table: the date is shown like: "2011-12-31 0:00:00".he problem is that I want to use the datetimepicker in VB.NET to compare the date in a SQL statement that looks like this:
strZoekGeboorteDatum = String.Format("AND M.GeboorteDatum > " & Me.dtpZoekMedewerkerGebDatVan.Value
But probably the comparison is:
[code].....
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Mar 14, 2011
how to disable the datetimepicker dates in the future and also all the weekend dates but i am unable to find any! Only thing i can find is ASP.net code.
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Jun 29, 2011
I have two dates, a creation date and an expiry date. I want to find out how many years and months (not days unless it is only days) between them.
I've got two dates:
Dim start_time = "12.5.2011"
Dim end_time = "15.11.2014"
I want it to say (3 Years, 6 Months) etc
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Nov 27, 2011
I have now started posting to a MySQL database created by someone else. I have no ability to change the table structure.Two questions:
1) There is a date field and a time field that loosely tracks the last edit date and time. Both are fields set up as DateTime in the database. The date field always has the proper date but the date and time portion shows as
2011-11-27 00:00:00
However, the time field shows as
1899-12-30 23:16:58.
When I am updating with the following code
strSQLCmd.Parameters.AddWithValue("@EditDate", Date.Now)
strSQLCmd.Parameters.AddWithValue("@EditTime", TimeOfDay)
The date field displays
2011-11-27 23:40:26
and the time field displays
0001-01-01 23:40:26
I'm not sure how to format the date field without time and the time field with Dec 30 1899.Question 2) I will be adding some tables and will be wanting to track date and time of first entry as well as date and time of last edit. (this may have been better posted in the Database forum, if so, sorry)
For those of you who have done this before, would you mind sharing best practises? I am wondering why would you use two fields, one for date and one for time, when the field is a date/time field to begin with. I've seen this before in another database as well. I'm just trying to work out the logic here.
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Feb 3, 2012
I am using vb.net2010.
I am currently writing a bit of software for myself and need guidance.
I have a datagridview on a form with a date column. (column0)
I am trying to sort this by date desending but it will only sort by the day (dd) and not the whole date (dd/mm/yyyy) which leaves the months unsorted.
(example of output):
#1 - 01/03/2012
#2 - 02/01/2010
#3 - 03/02/2011
[code].....
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Apr 2, 2011
I need to sort the values of my listbox to have the latest date on top plus some text. here is the code I'm using:
[Code]...
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Jan 12, 2011
Say the user specifies these two dates....
Start Date: 2010-12-05
End Date: 2011-01-15
If I select December 2010 I should get the folllowing
startdate = 2010-12-05
enddate = 2010-12-31
Select January 2011 then
startdate = 2011-01-01
enddate = 2011-01-15
Should I subtract dates? How can I get the start and enddate for the current month/year based on the overall start and end date.I'm coding in vb.net.
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Oct 2, 2009
I'm using two datetimepicker controls to set the start and end dates for a range of dates I'm searching for.I want to make sure that the start date selected is not greater than the end date. This code works, but it runs the messagebox prompt twice for some reason. I've tried to ignore it from doing this, but it's not working. Can someone tell me what's wrong?
Private Sub dtpStart_ValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles dtpStart.ValueChanged
[Code]...
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Aug 2, 2010
I try to make a WFA for filling, reading etc. to a database. I want to compare 2 dates (actually 1 date is changed by 42 days) that are chosen by a user through a datetimepicker. After comparing the 2 dates the "newest" date has to show up in a non editable textbox. This Is my code (of course I have 2 subs for the datetimepickers as well).
Private Sub AwbdatumTextBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AwbdatumTextBox.TextChanged
Dim DatumbinnenkomstDateTimePicker As DateTime
[code]....
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Nov 15, 2011
Unable to display data in datagridview : vb 2010 express + mysql server 5 + odbc connector
1. I am able to connect database successfully. I am using arraylist to set data.& also i m
getting till it set to dataview (Object name )
2. Till now i am not added any column name in datagridview property setting .
[add/remove column]'[code...]
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Mar 16, 2012
I have the code which gets HTML code and puts it in a richtextbox with seperate lines.I would like the richtextbox to delete each line which doesnt contain a url in it.
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Mar 18, 2012
VS 2010 ContextMenuStrip not showing?
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Aug 8, 2009
I made a program and had an icon for it, well i recently when to chaneg the icon, the one that shows up on the desktop and when i did it now shows up as a window instead of what i want it to be, so i chanegd it back to he original icon and it is still the window
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Jun 30, 2011
Well I accidently double clicked both of my forms in a project and then they weren't pinned anymore so I exited them out hoping they'd be pinned aghain, but now when I open the project, no forms show up. Just blank blue wall... How can I get the forms back?
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