I'm adding a DateTime DataColumn to a DataTable like this:
Dim colDate As DataColumn = New DataColumn("Date")
colDate.DataType = System.Type.GetType("System.DateTime")
dt.Columns.Add(colDate)
Then when I try to add it to my datatable, if the value is Nothing I get an error saying string was not recognized as a valid DateTime. I'm having trouble getting this to work.
How do I go about adding a ButtonColumn to a DataTable.
I am basically using a DataTable as the DataSource of a DataGrid and need to add a ButtonColumn to the DataTable so that when I DataBind it to the DataGrid it all works.
Although when I try
dt.Columns.Add(buttonColumn)
This is not allowed. It has to be a basic DataColumn.
Can anyone demonstrate with an example how to shift the position of a datacolumn in a specific position after it is added at the end of a datatable.For example lets say I have a datatable with 9 columns and 5 rows. Now I added a 10th column. However I need this new column as the 5th column which requires shifting. How do I perform this shifting?
View 3 RepliesI defined a DateTime datacolumn in a datatable dt as [code]]....
View 5 RepliesI have a DataTable with two DateTime columns: "start_time" and "end_time".Now, I want to add a third column that calculates the difference between the two DateTimes. But I can't seem to figure out how. I've tried to set the .Expression-value to "start_time - end_time", but it says that "-"-operator is not allowed on DateTime.
View 4 RepliesI am currently working with a datatable and I want to be able to show richtext in a column of the table. First question can this be done? I can force the column to be Type Of richtext box. However, when I try to view/display the table, I get something like..."System.Windows.Forms.RichTextbox, Text: Text That I have added" in the column.
Is there a way that I can get it to show the rich text in a cell of a datacolumn of a datatable?
I have a datatable which loads data from an Excel Spreadsheet. One of the columns in the Excel SpreadSheet was of type "Date/Time" in which date values are stored. Now I appended the datatable with three new rows and I wanted to store string values in these rows using the code below. However due to the fact that one of the columns are date/time type, an error is generated as date/time column does not accept string value. I have two questions
a. Is it possible to store string value in date/time DataColumn?
b. Is there a remedy to this situation? [code]
Anyone have any ideas what would prevent my data from not be ing able to be bound to my data column? [code]My error says cant bind to column named SellingPrice? I have many other columns ALL binding the same way and other parts of my program recognize SellingPrice ?
View 9 RepliesI'm trying to load a datable into a datagridview, but column1 ("date") should be converted to a datetime, so I can sort it when I click on the datagridview header
View 7 RepliesI've got a calendar app where we're loading up a DataTable from one method, then merging the results with another method - both methods return the same type of data and the same columns. One of the columns in the results is "start_time", which has a date and time. What I want to do is sort the entire, merged, DataTable by the time in the "start_time" column, disregarding the date completely. I've gotten this far, but can't see how to get it done:
Public Function GetDates(ByVal dStart As DateTime, ByVal dEnd As DateTime, ByVal nPageId As Integer) As DataTable
Dim dt As DataTable
[Code]....
I think I need to create a new column and grab the time from the start_time column and then re-sort the table
I do have the following problem extracting records from a datatable, based on date.
I am using Datatable.compute to sum the relevant rows, at least I'm trying to!
CrTot is a variable of type double
BankTrans is a datatable
dteRecDte is a datetimepicker component
CrTot = BankTrans.Compute("sum(bank_amount)",
"bank_amount > 0 And date_bank_reconciled <="
& dteRecDte.Value.Date)
doing the sum calculation on it's own works properly. I now need to check that the date of the "date_bank_reconciled" field is less than or equal to the value of the date entered in the datetimepicker "dteRecDte.Value.Date", so that only rows with a date either less than or the same as that in the datetimepciker are returned.
[Code]...
what sould i fill in the part after ---addressof--- i dont now what to fill after
I'm trying to load a datable into a datagridview, but column1 ("date") should be converted to a datetime, so I can sort it when I click on the datagridview header. I tried this, but it gives me that there is no column 0 or one. I have 2 columns: "ID" and "DateStart"
[code]...................
I have a session which contains a datatable and also have a function which returns a datatable. I need to add these two. How can I do this? The below code is to be replaced with correct code.
Session("Table")=Session("Table")+obj.GetCustomer() where obj is an object of the business layer.
The '+' sign cannot be used to add these two, so how can I do this?
I have a datatable and I apply a filter to the defaultview.rowfilter property of that datatable. If I then loop through the rows collection of the datatable, will I only be able to see those rows that the filter applies to, or will it loop through all the rows?
View 6 RepliesI am trying the following code and getting the sql date time overflow exception.....The problem lies in the Gold part...rest to i.e. Silver and Premium work fine....When in Gold part I try to add certain number of months to a date time field I don't know what action is performed as when i check it through Message box the ren_date has value "12:00:00 AM" rather than the new date value after adding 6 months in mem_date value....
[Code]...
I am trying to add a checkbox to a toolstrip using the msdn sample of adding a datetime control [URL]...
Protected Overrides Sub OnUnsubscribeControlEvents(ByVal c As Control)
Call the base method so the basic events are unsubscribed.
MyBase.OnUnsubscribeControlEvents(c)
Cast the control to a MonthCalendar control.
[Code]...
I have a DataTable oDT. oDT is populated from SQL Server with 6 columns including a column "bAAA" of varbinary(200) I have a function fx(ByVal byteArray As Byte()) as String I would like to add a calculated column to oDT something like this:
oDT.Columns.Add("sAAA", GetType(String), fx(bAAA))
'bAAA is not declared
oDT.Columns.Add("sAAA", GetType(String), fx("bAAA".ToArray))
[Code].....
i have a problem when add data into dataTable. The problem is that after populating the dataTable with the 1st, and when adding a 2nd column, the row that contain the data is not at 1st row of 2nd column. It is directly under 1st column row. For example, column 1 has 10 rows of data. After adding the 2nd column, the data is at row 11 instead on the 1st row. Can someone tell me how to add the data for 2nd column so that it will be in the 1st row. Code for adding the data
Dim col1 As DataColumn
Dim row1 As DataRow
col1 = New DataColumn("Column 2", System.Type.GetType(" System.String"))
dTable.Columns.Add(col1)
[code]...
I've VB.NET function that reads data from an Excel sheet and adds rows in a Datatable.
Private Function LoadDataToRows(ByVal TableName As DataTable, ByVal Header As System.Collections.Specialized.StringCollection) As Boolean
Dim HeaderDataExcel As String = String.Empty 'Data Header
[Code].....
I have a DateTime field in database and DateTime variable in VB.The VB variable is holding the date as 25/03/2008 11:57but when i save it to DB it changes to 03/25/2008 11:57.What is the solution to this microsoft nightmare.
View 14 Repliesi have a table where in date column i have datetime datatype..i want to get only time in textbox...but i m getting both date and time by this below code. i m using vs 2005...sql 2005
[Code]...
I want to update the date and time from two separate pickers to my table.My 2 DTPers are bound to a dataset.One is in the Short Format, the other is Time.I have several other bound controls, and I just do a .Update to update my table. I tried just updating the row:
Me.DsTradeShow1.Tables("Tradeshow_Details").Rows(0).Item("Show_Date") = CDate(Me.DateTimePicker15.Text & " " & Me.DateTimePicker16.Text)
but it throws an exception when I do my save.
[code].....
See the code below which is triggered on a datagridview row validation event where the datagridview datasource is a datatable.
The messagebox shows that it loops around as expected populating the datarow with the expected values (NOTE: There are no primary keys as this is a college assignment with specific requirement and all fields can be nullable).
I had to use ImportRows as AddRows would always error due to "This row belongs to another table" the odd thing was the values were different and again the table contains no primary keys.
The code below runs but never adds a datarow to the dataset datatable "Bookings", does anyone know what the problem might be?
CODE:
I am trying to add a datatable to a database. Here's what I've been trying:
Dim newDataTable As DataTable = New DataTable("Example")
VocabularyDataSet.Tables.Add(newDataTable)
SqlDataAdapter1.Fill(VocabularyDataSet.Tables("Example"))
I've tried various incarnations of Fill and Update. But the tables will not save on the database!
I have an array which holds the following items
for example
Quote:
myArray(0) = (1)
myArray(1) = (4,2)
myArray(2) = (10,15,20)
[Code]....
and then am trying to add other column based on items available in myArray().
i have problem about datetime i use os vista,sql server 2005,vb.net 2008 string is = "insert into ....... values('23/3/2009')" in program time is correct but when i go to sql server,it's show 23/3/2555 when i saw at os is 23/3/2009 i think this problem at sql server but i don't know how to fix it Do you understand me?
View 1 RepliesHow do I achieve the same in VB.NET which is so easily done in SQL Server.
Select Case(GetDate() as VarBinary(8)) --Gives the Current Time in Hex
How can I create the same string in VB.NET so that I can compare in SQL Server as such -
Select Case When GetDate()=Cast(0X00009F5E00D8DF7C As DateTime) Then 'True' Else 'False' End -- 0X00009F5E00D8DF7C Will be the value I get in VB.NET When I convert it Date.Now() To Hex
Weird problem that just started, I am using an OleDbCommnad to create a dataadapter then fill a table everything from a .csv file, works fine except no dates are coming over? I added a datagrid view to my project just to see and any column that should have a date value is empty. I confirmed that the column is of System.DateTime value so I am at a complete loss?
View 7 RepliesPreviously I converted a string with year, month, day and minutes/seconds using
CDateTime(conYear, conMonth, conDay, conHour, conMinute, conSecond)
This code will no longer work in VB.net and I cannot figure out how to do this with 2005 VS. The string originally is something like "20100310142715" and should be broken down into year, month, day, hour, minute, second.