Forms Data Controls :: Filter The Columns Of A DataTable?
Aug 2, 2010
I've built a User Control that contains a ListView. To make it work I need to pass to it a DataTable. The columns of this DataTable need to have particular names that match up with what the ListView is expecting. I have a large DataTable that I need to massage/convert over to this different format. To do that I need to filter out columns and rename the column names. The actual data in the DataTable doesn't need to change. Is there a good way to do this without actually instantiating a new DataTable and copying the data from the large DataTable into it?
i have gridview and data already binded like this...
First Name Last Name Age Date
Qasim Nadeem 26 13/01/2010 Ali Ahmad 20 17/02/2010 Qadeer Numan 18 23/08/2010 Ahmad Asghar 20 23/08/2010 Mohammad Nadeem 26 13/01/2010
now i have One TextBox and four radio button like 1.rbFirstName,2.rbLastName,3.rbAge,4.rbDatemy requirment is if i select radiobutton first rbFirstname and i will enter a text into textbox than ONKEYUP filter the gridview data and show only those row where data is match in first coloum"First Name" and hide the rest of rows...same required for radiobutton 2,3 and 4 respectively in gridview 2nd ,3rd and 4th coloum....i need this solution in javascript or Jquery but i dont want reload the page...
HOW TO specify which columns are in a DataView from a DataTable. I want to create a DataView, that only has the columns from a DataTable that I choose, and in the order I want.
Example: // DataTable_MyTable ~~ Column #0 is for ID. I do not want my view to get this column. // DataTable_MyTable ~~ Column #1 is for TYPE. I want this column to come in 2nd place in my view. // DataTable_MyTable ~~ Column #2 is for NAME. I want this column to com in 1st place in my view.
DataView DataView_MyView = new DataView(DataTable_MyTable ~~ some how only get the columns I want, and in the order I want ~~);
// DataView_MyView now has only 2 columns. // DataView_MyView ~~ Column #0 is NAME. // DataView_MyView ~~ Column #1 is TYPE.
i could bind the data form tables to dropdownlist in asp .net using linq.
ex: var res=from n in dc. contacts where n.location==Hyd select new{n.Id,n.Name}; var res1=from n in dc. Morecontacts where n.location==Hyd select new{n.Id,n.Name}; dropdown1.Datasouce=res; dropdown1.DataTextField="Name"; dropdown1.DataValueField="Id";
I have a ListView with Checkbox. My requirement is - When I click on any checkbox then it should return all the columns values of that row on behalf of that CheckBox. After much study I came to know that using DataTable and DataRow I can get all data of particular ID of a Row. But I am unable to work with this. My code is something like below:
I want to filter grid view, drop down list should select the column and text box will filter the column. like ID NAME Phone Designation fields in gridview.i will select Designation in dropdown and type programmer in text box .so it should filter programmers from the gridview...
How to fetch data in gridview and add newly added item column in same column? As I know fetch data in gridview, my prob is add new data in new column in gridview.
I'm looking for the best way (Performance) to do gridview columns formating RunTime /Dynamic depending on the datatable Columns type ,I want to bind the datatable to a gridview and format the Date columns to short date, and currency columns formatted with comma ex 10,000.00 inplace 100000.00 at datatable the column type is double run time (without converting them to String) since I do a filtering and sorting at these columns.
Dim dt As New DataTable Dim da As New SqlDataAdapter(s, c)
c.Open() if Not IsNothing(da) Then da.Fill(dt)
[code]...
When I call da.fill I am inserting all records from my query. I was then hoping to filter them to display only those where the GroupingID is equal to 0. When I run the above code. I am presented with all the data, the filter did not work. Please can you tell me how to get this working correctly.
I would like to implement LINQ IN ASP.NET for filter required data from datatable. I have doubt that what is right place. I have following options
At presentation layer *.aspx.cs
At our Business layer.
At our Data base layer, where query for database happen which is return as a datatable to business layer. Business layer then return the result to presentation layer.right place for LINQ because now i have to further filter data from datatable as per user selecter filters.
I want search with multiple names in Name coloumn. example I have pass the criteria to Name cloumn is 'Atul', 'Mayur', 'Suraj' this three names how to pass in a query.
I have a datatable with 17 columns and a bunch of data. I wnat a datatable with only 6 of the columns and the data for those 6 columns. So I need a subset of the original datatable. How do I loop through the original datatable with 17 columns and end up with a datatable with only the 6 columns I want with the corresponding data for those 6 columns?
If I am passed a datatable and I cant change the column structure..is there anyway to set an existing column to a Primary key so I can easily Find() the row I am looking for?
