Asp.net Mvc - Sorting Datatable With Linq With Correct Datatype Of A Column?
Mar 27, 2012
I have this code that use to sort a datatable.
Dim sortingIndex As Integer = orderby
Dim DataTableNew As DataTable = New DataTable
DataTableNew = dt.Clone
Dim query = (From c In dt.AsEnumerable Order By c.Field(Of String)(sortingIndex) Ascending)
query.CopyToDataTable(DataTableNew, LoadOption.OverwriteChanges)
My problem is that with this method I always need (Of String) for it to work, so the date columns are also managed as Strings witch is the problem. Is there a way to use the correct type so the sorting is based on the type of the column?
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Feb 7, 2011
I need to sort a DataTable or DataGridView by a column that is a string value, but with null/empty values at the BOTTOM when sorting ASCENDING. The DataTable is NOT populated by a SQL statement, so no order by. If I do
[Code]...
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Mar 5, 2009
I need to sort a DataTable or DataGridView by a column that is a string value, but with null/empty values at the BOTTOM when sorting ASCENDING.The DataTable is NOT populated by a SQL statement, so no order by.If I doDataGridView1.Sort(New RowComparer(System.ComponentModel.ListSortDirection.Ascending))then it throws an exception, saying that the DataGridView is DataBound, which is correct, but doesn't help me, and I want to keep it databound.
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Jan 7, 2012
I have a Dynamic DataTable Created at runtime. The Setup is like so
Id | Name | Age
-----------------
3 | Mike | 21
6 | John | 43
8 | Sara | 34
What I am trying to do is come up with a linq statement I could use to find and update specific rows.
Such as a statement to change AGE to '33' WHERE ID = '3'
My code So far is:
-[VB.NET]-
Dim MyRow As DataRow = From column In MyTable.Rows Where column("Id") = 3
MyRow(0)("Age") = 33
But this is not updating my DataTable entry.
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Mar 23, 2012
I need to sort a datatable. I do it with linq this an example
Dim query = From c In dt.AsEnumerable _
Order By c.Field(Of DateTime?)("LastPurchaseDate"), _
c.Field(Of String)("LastName") Descending
Dim dv As DataView = query.AsDataView
But my problem is that i need to sort the fields not by passing the name of the column but the index of that.
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Sep 21, 2011
i have been redirected from the vb.net technet forum to use asp.net forums instead.
I am using some COM components within an asp-page or vbscript. As an example the code flows like this in vbscript:
set objectA=CreateObject("SomeComponent.A")
objectA.PropertyA="Some String"
objectA.PropertyB=ValueA
set objectB=CreateObject("SomeComponent.B")
set ObjectC=ObjectB.MethodA ObjectA
This code works fine and i can continue with the data in ObjectC.
Now i want to change this into ASP.Net with VB. If i open the COM type libraries in Oleview32, the datatype expected in MethodA is VARIANT. So i tried to pass into a type of Object in MethodA. This leads to an exception and code stops.
Is there a way to determin or to trace what vbscript is passing into MethodA so that i can get an idea of how to prepare the datatype i have to pass into the method-call? Are there any tools for that? So ctypeing to an object does not do the trick. A better documentation about the COM Object is not available.
The first reply from the vb.net guys was´, if the COM libraries can be hosted on iis? So, they are used excessively within asp pages on iis 7.5, if they can be used in asp.net, i don not know. I am not a developer but i have good understanding in writing code and using asp.net.
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Mar 27, 2011
how can i use value (23,32) in sql column datatype int how can i use comma in column data type int
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May 3, 2009
I have a form that allows users to enter information into a few textboxes. When users click save, the information will be transferred into the datagridview.
My problem now is, for instance, there is a textbox called "Price" with the datatype "money" which users are only allowed to enter numbers. If users enter alphabets, errors will occur. I don't wanna use try catch, I would like to try different methods such stopping users from entering anything into the textbox when the datatype isn't correct - nothing will appear in the textbox when users hit all the keys in the keyboard except for numbers.
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Feb 27, 2009
ASPX:
<a
href="ShowImageVB.aspx?id=<%# Eval("ProdID") %>">
<asp:Image
runat="server"
ID="ImageThumbnail"
AlternateText="Click here to open the real size image"
ImageUrl='<%# "ShowImageVB.aspx?thumbnail=true&ID="& Eval("ProdID").toString%>'
Style="border-width:
0px;"
/>
</a>
Code Behind:
Dim data As DataView = SqlDataSource1.[Select](New DataSourceSelectArguments())
The above code does not seems to work when I change my ProductID to UniqueIdentifier Datatype. This is the error I have ""Input string was not in a correct format."
But when change the ProductID to Int datatype is working fine.
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Mar 12, 2012
I'm having my program sort an excel sheet by a few columns. However, it is only sorting by the first column not the rest that I specify.ere is my sort code below:
myRange.Sort(Key1:=myRange.Range("A:A"), Order1:=XlSortOrder.xlAscending, Key2:=myRange.Range("G:G"), Order2:=XlSortOrder.xlAscending, Header:=XlYesNoGuess.xlYes, Orientation:=XlSortOrientation.xlSortColumns)
[code]...
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Jun 20, 2012
I have a window application created in VB.net 2005 and the backend is sql. I make a call to the database and it returns a datatable. When I loop through it, I get a value of -1 for my field "Rush" which is a bit datatype. when I pass the sql into the analyzer, I see the value should be a 1 so not sure why it's giving me a -1. Here's some of the code that's in the page: Dim tblSendEmail As DataTable
tblSendEmail = oService.GetSendEmailInfo 'Goes to a webservice and returns a record set in the datatable
For Each row As DataRow In tblSendEmail.Rows
iRush = row("rush")
next
[Code]...
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Jan 5, 2009
I have a datatable that I read xml into.
One of the columns is a date, but the dataype of that column is set to string. Is it possible to change that dataype to date?
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Sep 7, 2011
I want to change the DataType of all columns of DataTable. I don't want use the loop.. [URL]
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May 9, 2011
I have a query to retrieve DateDiff in my SQL:
SELECT Convert(char,DATEDIFF(m, Temp.Opening_Date, '2011-05-01')) As MonthDifference From Temp
It was successfully retrieve the data from SQL Server. But when I bind it to my vb.net datatable, the value is null. It's seems like vb.net datatable doesn't support datatype from DateDiff... What can I do?
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Jul 9, 2010
I have a datatable which has a number of rows containing dataThen I need to add some empty datacolumns which I do like this:
Code:
Dim OT_Hours As New DataColumn("OT_Hours")
OT_Hours.DataType = System.Type.GetType("System.Double")
[code].....
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Mar 1, 2011
I have a DataTable that has a hierarchyid data type column pulled from SQL Server. Is it possible to use the column to easily populate a treeview object in Visual Studio 2008?
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Mar 15, 2011
I face a problem that if i make a datattype in sql server of Integer and then use it in linq to sql query it give error of "specific cast not valid" and when i change datatype into varchar the linq to sql query work fine one more thing how to use linq to sql query to make crystal report?
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Jun 1, 2009
with linq to sql(dbml file), how to get the size of a datatype?
for an example, varchar(50), how to get that 50?
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Mar 15, 2009
I have a datatable which has 5 column. It is possible to copy only its 2 column in and save it into new datatable.I used this code but it copies all the 5 column
Code:
Dim qry As DataTable = (From obj In temptable Where obj.Item("Column1") = 0 _
Select obj).CopyToDataTable
i used this one but it is not supported
Code:
Dim qry As DataTable = (From obj In temptable Where obj.Item("Column1") = 0 _
Select obj.item("Column1"), obj.item("Column2")).CopyToDataTable
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Nov 3, 2010
I pull a report from SQL Server being not a fan of cursors I process that table server side in my code behind file. So I pull this report that is an address label report and my client wants there to be X number of labels per person. So I coded this function:
Private Function ProcessX(ByVal dt As DataTable, ByVal X As Integer) As DataTable
Dim dtProcessed As DataTable = dt.Copy
dtProcessed.Clear()
[code].....
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May 11, 2010
is there a date datatype in visual studio 2008? cause i want to create a column name with date as its datatype.. but the one that comes out is datetime..
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Nov 30, 2010
Dim pctofpax As New DataColumn
pctofpax = New DataColumn("PCTPAX1", GetType(Decimal))
pctofpax.Expression = "[ASOFPAX] / [YEPAX]"
[code].....
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Jan 13, 2012
What i am trying to do is get the data type of the sorted column that the user selects in order to properly convert a variable. the variable will be used to locate similar values in the dataset that populates the datagrid view.
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Jun 23, 2009
how to change column into checkbox with datatype of Boolean?
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Feb 2, 2009
I have a dataset with numerous tables.I have changed the column type of a couple of columns in the source DB form smallint to int.No I need to update the datasets (and eventually the code) to the appropriate datatype.Rather than hunt around the dataset and find all the places where these columns are referenced is there a way to direct the dataset to go back to the DB, reread the queries and update the datatypes.I know I can either change the field or one by one go to each table and force it reread the query but I want the dataset to do it in mass.
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Dec 26, 2008
how to work with XML.I need to create an multilingual application and need to save the controls captions in sql table with xml data typei started the following:[code]I know this is not very professional but thats all i did until know in SQLNow i have a problem in VB.NET i don't know how to read an xml data type (How to get the value from variables).If somebody can give me an exmaple how to read the xml than i would continue translating for each objects in the form where name is like the variable "btnLogin" and give it the controls.text property to the variables value.
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Mar 9, 2009
I have a column in DB called price with Decimal as its datatype. when I use:dim r as objectAccessConnection.Open()cmd = AccessConnection.CreateCommand()r = cmd.CommandText = "SELECT AVG (Price) FROM Sale;"I receive an error "Decimal byte array constructor requries an array of length four containing valid decimal bytes."It works fine with other datatype such as Integer and Double. What is my problem?
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Dec 25, 2010
I want this for a windows forms application (vb.net '08). I want a code for: I have a column called total that is of datatype double in SQL Server 2005. How can I sum this field or column in crystal report?
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Jun 11, 2012
I would like to sort data in my datatable I am focusing on one of my columns that I want to sort in ascending order. Currently I have been using the following code
[Code]...
I nwant to sort the data so that I can output the data in a gridview.
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Jan 25, 2010
I have a problem which I am struggling to efficiently put into code. I have a datatable
ID | NAME | DATE | JOB
0 | Joe | 01/01 | Selling
1 | Bob | 03/01 | Buying
[code].....
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