C# - Handling Dynamic Number Of Columns?
May 26, 2010
I'm developing a CMS of sorts, and I want to give my users the possibility of customizing the display. More precisely, I want to give them the ability to choose to display or hide the left column, the right column and/or the top div. The middle column cannot be hidden since this is where the actual content will show, whereas the other columns are for navigation or side menus.
I've been looking for a way to make this as smart and flexible as possible. For now I'm using a MasterPage, but that seems to be too constraining. For instance, with MasterPage you need to add a ContentPlaceHolder control in every of your ASPX pages.
What are the best practices in this area? I guess a simpler way of saying this would be "I want to create a template system over which I have complete control".
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Sep 20, 2010
I created a gridview that is made up of 4 gridviews and using a stored procedure to populate it. I create columns at runtime because the number of columns changes all the time.To make the grids editable I am adding template fields at runtime as I create the columns, this is to ensure that a user is able to edit the cells and some foot values update. Reason why I have four grids is to freeze rows and columns like in excel using javascript. The problem is that performance is very bad especially in IE, the grids take a long time to load. I am not sure if this is caused by the data load or the creation of text boxes. see some of the code below for my _aspx page:
[Code]....
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Dec 1, 2010
I wanted to gather some methods on how to add a variable number of fields to my form (with Add New and Remove buttons). I know that ASP.NET MVC has easy methods, but I'm unable to find any easy methods for WebForms.
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I have a custom control which contains (amongst other things) an imageButton.
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here is my code:
[code]....
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Feb 5, 2010
In one of my ASP.NET webform application I want create dynamic controls and add Event handlers for those dynamic controls..For example when I click a button I want to display a list box and I want to add
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[Code]....
[Code]....
DLabel is a existing label control...*** When I click the button I get the ListBox... When I select the Item 1 the page reloads and nothing is displayed in the Label.
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I have the usual problem of dynamically created usercontrols not hitting the event handler for a linkbutton inside the control, but I've checked the usual problems and I can't work out what's wrong. I'm calling a function to create the controls at the bottom of my page.load (although I did try page.init as well just in case) outside of my page.ispostback check, and I'm setting the controls id's to a fixed name which is consistent across postbacks. Any ideas what's wrong?
[Code]....
Usercontrol code:
<asp:LinkButton runat="server" ID="lnkDeleteGroup" Text="Delete this group" />
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Mar 15, 2011
I have a user control which I am dynamically loading in my page_load event via a method (see below). The user control contains a gridview and a label. A key piece of information has to do with how to get around the convenient feature of gridviews not rendering when their datasource is empty. In my user control I add some hidden rows so that the grids will render and the user can see just the headers (if the situation calls for it).
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[code]....
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Mar 1, 2010
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this is in a loop of the DataSet
for (int i = 0; i < dsResult.Tables[0].Rows.Count - 1; i++)
{
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[Code]....
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May 27, 2010
I created a customDropdown usercontrol with Events and It worked fine.
Now I stored the path of the ascx file in the database table and i want to Load the ascx file and handle the Events dynamically in an aspx page.
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Since I am loading the usercontrol by getting the path and name of the usercontrol from the database table,how will I know the ObjectType at that time?
How to accomplish that and also how to handle the events for these type of situation?
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Sep 28, 2010
What would you all suggest a database with less number of tables and more number of columns or more number of tables with less number of columns. I am developing a web application using Visual stuio 2005 and Sql Server 2005
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Dec 6, 2010
I've got a sql table, that just keeps getting more and more columns added. I optimize the db as much as possible, but am curious about how many fields a table can have, and if there is a way to check if I'm getting too much data per row?
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Mar 16, 2011
I have a page within our site that allows admin users the ability to upload configuration settings into the system instead of submitting 1 at a time.
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Mar 7, 2012
I have 65 columns in the grid, if the columns are reduced to 20 then the speed when accessing from client is more or less similar to that accessing from web browser. Does it mean that all this performance issue is due to the data only ???
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Apr 21, 2010
I'm trying to read a CSV file into a DataTable using OleDbConnection and OleDbDataAdapter. It works loading the DataTable, but only does 255 columns. The file has 362 columns.
Code is as follows -
[Code]....
I have a schema.ini too -
[Code]....
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Nov 21, 2010
One of the reports I am creating has dynamic number of columns - a datatable gets returned from the stored procedure, the number of columns depend on the number of items defined in the database (one column for each item, other than some fixed columns). Is it possible for me to use RDLC report to generate a report in this case? All the calculations are already done int he report, I am looking at RDLC only for the sake of export to excel/pdf and repeating header/footer.
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Jan 7, 2014
I have an HTML markup which has HTML Table and Images in it. I am using iTextSharp API to convert the HTML markup to PDF. But, unfortunately the iTextSharp fails to export the HTML markup containing the Images & Table to PDF.
Error: The network path was not found.
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.html;
using System.Data.SqlClient;
using System.Text;
using iTextSharp.text.html.simpleparser;
[Code] ....
I know this error is due the Image Path. But, not able to resolve.
I want to create PDF in a folder and not be able to downloadable to user.
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Mar 16, 2013
I am trying to add row in DataTable CartDT using row[], which is a string array.
DataTable CartDT = new DataTable();
public void DataTableColumn()
{
CartDT.Columns.Add("Product_Name", typeof(string));
CartDT.Columns.Add("Product_ID", typeof(string));
CartDT.Columns.Add("ItemQTY", typeof(string));
CartDT.Columns.Add("Price", typeof(string));
CartDT.Columns.Add("TotalPrice", typeof(string));
[CODE]..
Now when I execute it, it gives the error that "Input array is longer than the number of columns in this table" The array row[] has exactly 5 elements in it & also DataTable CartDT has also 5 columns. Now i am not able to find exactly where i am wrong.
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May 7, 2015
sb.Append(" <table width=100% cellspacing=0 cellpadding=2 class=table1>")
sb.Append(" <div style=text-align: right;>")
sb.Append("<input type=button onClick=window.print() value=Print></input>")
sb.Append("</div>")
sb.Append("<tr><th align=center Cssclass=theadPO style=background-color: #18B5F0><b>Order SHeet</b> </th></tr>")
[Code] ....
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Aug 24, 2010
Im using LinqDataSource like that:
<asp:LinqDataSource ID="LinqDataSource3" runat="server" OnSelecting="LinqDataSource3_OnSelecting">
</asp:LinqDataSource>
And I have ASPxGridView
<dxwgv:ASPxGridView ID="ASPxGridView2" ClientInstanceName="ASPxGridView2Client"
runat="server" AutoGenerateColumns="False"
DataSourceID="LinqDataSource3">
</dxwgv:ASPxGridView>
In this way Im able to add columns dynamically while handling onSelecting event:
protected void LinqDataSource3_OnSelecting(object sender, LinqDataSourceSelectEventArgs e)
{
MyModelDataContext context = new MyModelDataContext();
ASPxGridView grid = ASPxPageControl1.TabPages[3].FindControl("ASPxGridView2") as ASPxGridView;
if(grid.Columns.Count == 0){
GridViewDataTextColumn txtColumn1 = new GridViewDataTextColumn();
GridViewDataTextColumn txtColumn2 = new GridViewDataTextColumn();
txtColumn1.FieldName = "UserId";
txtColumn2.FieldName = "FirstName";
grid.Columns.Add(txtColumn1);
grid.Columns.Add(txtColumn2);
}
e.Result = from u in context.Users select new { UserId = u.UserId, FirstName = u.FirstName };
}
It is all made simply to test cause my idea is to have solution that makes it possible to use inqDataSource as a datasource for de ASPxGridView but join 2 or 3 tables and show results in this grid.
What I want to ask is if its good solution or is there any other better way to present some views made from couple of tables by join?
Second question is that I have Users and Group and I would like to have one table in which I would have two columns Name and Type For groups type would by group and for users type would be user. I dont have such a table in my database Is it possible to create specific class. Create List of objects of that class and fill it using linq query and the use it as linq data source for that grid ?
clas would be:
pseudocode:
Class MyClass {
string Type;
string Name;
}
or is there any other way to create such a table ?
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Mar 24, 2011
In my gridview I have a datetime columns and couple of decimal number columns. Lets say I have a datetime value like this 19.03.2011 00:00:00 and I want it to seem like 19.03.2011. And I would like 2 decimal digits only. How can I achieve this?
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Jan 23, 2011
I have the following stored procedure and if I execute this on our SQL analyser it returns the record no problem what so ever. BUT if I execute this through ASP.NET (I am using EntitySpace objects) to generate this query into data table and it saying that: "Cursorfetch: The number of variables declared in the INTO list must match that of selected columns."
I've discussed this with EntitySpace team and they said it's query issue? We are stuck with this issue and any guidance or hints that will be good.
The environment that we use:
.NET 4
EntitySpace 2010
SQL Server 2005 Database
ALTER PROCEDURE [dbo].[rpt_CPRRespondListReport]
(
@SurveyID INT
)
AS
BEGIN
SET NOCOUNT ON;
[Code]....
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Nov 2, 2010
I finally got the DynamicLibrary issue nailed down I asked about in another post. The basic gist is that there's a project table that renders to a View. The user can, at runtime, choose the columns to display and the order in which they should be displayed. Here's the method that does the work:
[Code]....
This works great. The SerializeToCsv() method is an extension method I created for generic string lists. I used the jQuery UI bundle to create a sortable set of 'ul li' elements with checkboxes in them, which allows users to select which columns to show, and in what order. When the post happens, the current order the elements are in on the View is the order in which they're added to the FormCollection, so I don't need to do anything special to track ordering. So far, all is working according to my evil plans.
The problem I have now is how to render this in the View dynamically at runtime. It's very easy to check for the Model's property values and display them selectively, but not to reorder them. Off the top of my head, I can think of a few ways to do this, but none of them are very attractive. The first idea is to send the Model in as a collection of objects. The query that returns the data as shown above already has the columns returned in the order the user chose, so I could wrap them in objects and render them as string representations in the View. This is clunky, ugly, and won't give me the support for the actual data types boxed in the objects. I'd have to convert them all to strings in the service class and then wrap them in objects, because the View wouldn't know if it was dealing with a DateTime, string, int or whatever. I REALLY don't want to take this route. Can anyone give me some advice on a better way to reorder and selectively display columns at runtime?
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