DataSource Controls :: Update Datatable Changed Rows Only?

May 24, 2010

I am using untyped database bind to gridview in an edit form. Now user makes some changes to that datatable (update, delete, insert). How do I detect which rows he changes and which rows he deleted (so I drop them from DB). I know it can be done easily via table adapters but I am supporting a previously built app using untyped datatables/datasets.

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DataSource Controls :: Update Only Changed Or Insert New Rows In Datatable?

Mar 4, 2010

Existing records can be updatedNew records can be insertedAll existing records can be deleted & new ones can be insertedExisting records have a primary key field
New ones are just blank inserts

All this detail is stored in a data table. On form update I only want to update existing (only modified rows) & insert new rows. I have gone about loading the changed records in a new data table

DataTable changedRecordsTable = dataTable_old.GetChanges();

How do I compare it with all the records in the old datatable and pass them to the save query ?

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DataSource Controls :: How To Add Rows To Datatable And Use Sqldataadapter Update Method

Jan 24, 2010

I'm trying to add new rows to a data table and then use the sqldataadapter update method bu fund some problems. First, I written this code:


Excuse me but the most part of variable are in italian, however I think it is possible to understand how does it work. If I execute this code I obtain this error:

System.InvalidOperationException: Update requires a valid InsertCommand when passed DataRow collection with new rows.

After this I added these lines of code just above the last line:

SqlCommandBuilder cb = new SqlCommandBuilder(adapter);
adapter.InsertCommand = cb.GetInsertCommand;

and I obtained this error:

Cannot convert method group 'GetInsertCommand' to non-delegate type 'System.Data.SqlClient.SqlCommand'. Did you intend to invoke the method?

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DataSource Controls :: How To Select Rows From A DataTable And Create A New ViewList With The Selected Rows Only, While ...

May 31, 2010

I have one big DataTable with X rows. I want to select Y rows from it and bind them to a new ViewList. While doing it, I want to delete these rows from the DataTable (Having X - Y rows).

What is the best and fast way to do it?

I don't know if it is better to create a new DataTable to have the Y and after that bind them to a ViewList or something else?

I'm also looking for example in code how to select/delete rows from DataTable.

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Forms Data Controls :: How To Update A DataTable And Update Multiple Rows Due Sorting

Jan 17, 2010

i want to build a datagrid bound to a datatable with several columns. One column has only a dropdownlist with the number of the rows in the datatable.

Here a samplescreenshot:


I know how to bind the columns to a grid and its no problem to create such a dropdown list with the content for me, too. But i dont know how to sort the complete datatabl after changing one value of one dropdown listbox.

So, how can i resort the values of a datatable column based on a given value and the datarow id?

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Forms Data Controls :: Get Changes To Only Update Changed Rows From GridView?

Feb 1, 2010

I've got a GridView in which all rows are set to Edit by default.

I want to be able to save the rows only where changes have been made. At present, my code will only update the first row from my GridView to my database. I've had a look on the internet, and think that the Getchanges might be able to help me, but I'm struggling to work our how exactly to implement it in my scenario.


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DataSource Controls :: How To Add New Rows To Datatable Using Loop

Feb 26, 2010

iam working with gridview in asp.net3.5,Sqlserver2008 I am retrieving data from a SP into a datatable.i need to store this table into gridview. but am getting the last row from my datatable into my gridview.

here i need to add each row to the datatable.

my grid is like this:


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DataSource Controls :: Serialize A Datatable With 700,00 Rows?

Jun 24, 2010

I get the usual system.outofmemoryexception with the code below.

Is there a way to do this in small chunks?

public static void Serialize(DataTable dt, string filename)
FileStream fs = new FileStream(filename, FileMode.Create);
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bf.Serialize(fs, dt);
catch (Exception)

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DataSource Controls :: Adding Rows And Updating Tables From Datatable

Mar 7, 2010

Maybe this could be a simple questino, but for me it's difficult to do this action: I have a table in sql server 2005 with some records stored, for example 10 records. The primary key of this table, let's call it "Employee", it's a number field with an autoincrement constraint. I want to store more data into the table by using a OdbcDataTable object and OdbcDataAdapter and adding new rows to the datatable and afeter that use the "Update" method from the OdbcDataAdapter object.

The big deal is this: let's suppose that I want a add a new record to the datatable object, using any method or code sequence that you want. if I have 10 records stored on the data base table, when I retrieve this table schema by using the OdbcDataAdapter "Fill" method, I have a copy of the data base table schema in the DataTable object, right?. if I add a new row on the datatable object, it's suppose that the primary key column of that table must AUTO-INCREMENT the value of the key, I mean if the last value that I store on the table was the number 10 on the PK field, when I add a new row on the datatable object, the PK value on the datatable object must be the number 11 if the autoincrement constraint is present into the DataTable object, but in my case, it doesn't work

So, How can I define the conditions or set the c# data objects properties to wor in that way???. In this moment the PK column on the odbcDataTable doesn't auto-increment its value when I add a new row on it.

Please helpe with this.

PD: I have another question about the DataTable object, how many records can store this object?? I have some problems with this because sometimes when I use the Fill() method to get data into the DataTable or a DataSet object there's no problem if the Fill() method retrieves about 142000 records, but when I retrieve over the 145000 records, when I inspect the DataSet or DataTable object by using the debuging mode, they have null value. Any of you can tell me why this situation ocurrs??

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DataSource Controls :: Check Datatable Rows For Existing Item?

Jun 12, 2010

I have one problem with my shopping cart that I really can't figure out all by myself.I want, if a item already exist in the datatable, the quantity to be updated for that item with the new number instead of creating the same item again.I have done a foreach loop because I think that is where I should start.Notes: MyRow[3] is the column holding the quantity.Code:



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DataSource Controls :: Delete The Rows Present In The DataTable From IEnumerable DataRow

Jul 22, 2010

I want to delete the rows present in the DataTable by using LINQ (with out looping)

The deleted rows will be come from a LINQ as below

IEnumerable<DataRow> MobileQuery = (from d in dtBillDetail.AsEnumerable()
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DataSource Controls :: Update 1 Row = 1 And Update All Other Rows = 0?

Apr 12, 2010

I have an update / insert statements. If the user selects the checkbox IsPrestigeFeatured, I want that row to be set to 1 and I want all other rows to be set to 0. E.g. so there is only one row which is "Is prestige Featured"

My update statement:

ALTER PROCEDURE dbo.Update_Property
@propertyId int,
@propertyTypeId int,
@Name ntext,
@Price int,
@DescriptionResultsExcerpt text,
@Description ntext,
@Characteristics ntext,
@IsRenovation int,
@IsCharacter int,
@IsPrestige int,
@IsHomepageFeatured int,
@IsPrestigeFeatured int,
@CityId int,
@DepartmentId int,
@CommuneId int

UPDATE Property
SET Name = @Name, PropertyTypeID = @propertyTypeId, Price = @Price,
DescriptionResultsExcerpt = @DescriptionResultsExcerpt,
Description = @Description, Characteristics = @Characteristics,
IsRenovation = @IsRenovation, IsCharacter = @IsCharacter,
IsPrestige = @IsPrestige, IsHomepageFeatured = @IsHomepageFeatured,
IsPrestigeFeatured = @IsPrestigeFeatured, CityId = @CityId,
DepartmentId = @DepartmentId, CommuneId = @CommuneId
FROM Property
WHERE (PropertyID = @PropertyID)

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DataSource Controls :: How To Check And Update Duplicate Record In DataTable

Jan 13, 2010

my requirement is to update a duplicate record in my website if anyone select a product more than one time then i have to check and update the quantity of that record.i use for loop for this but it is not working properly, it is running perfectly for one product but when i add another product it won't can i do this?Here is my code part which is run on add button click

if (sc.dtcart.Rows.Count > 0)
for(int i=0;i<sc.dtcart.Rows.Count;i++)


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Apr 8, 2010

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Dynamically Insert Rows In An Existing DataTable (No DataSource Used)?

Jun 1, 2010

I have created a datatable with three fields namely TimeTask, TaskItem and Count (count of user) eg; {"12:30AM-01:00AM" , T1 , 3}.

dataTable.Columns.Add("Task Time", typeof(string));
dataTable.Columns.Add("Task", typeof(string));
dataTable.Columns.Add("Count", typeof(int));
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dataTable.Rows.Add("01:00AM-01:15AM", "T1", 1);
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dataTable.Rows.Add("01:30AM-01:45AM", "T2", 9);
GridView1.DataSource = dataTable;

In this there is no task for the TimeTask "12:15AM-12:30AM" and "12:30AM-12:45AM" yet the TimeTask should be inserted as,

TimeTask TaskItem Count
12:00AM-12:15AM T1 6
12:15AM-12:30AM - -
12:30AM-12:45AM - -
12:45AM-01:00AM T1 5
01:00AM-01:15AM T1 1
01:15AM-01:30AM T2 4
01:30AM-01:45AM T2 9

How to chk for the missing rows? Is it possible to dynamically insert rows in an existing DataTable (No DataSource used) in this scenario.

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I want to allow people visiting my website to have the ability to change the displayed data in a DataGridView from a Dropdown box and have it auto postback. So options are in the dropdown box 10, 20, 30

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Also when new row is added and the first ddl is selected on postback the second ddl data is refreshing..

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I am going to outline my setup then where i am failing

UpdatePanel1 - Contents : 3 textboxes and AddButton
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AddButton adds new row to DataTable with data from textboxes, binds DataTable to GridView SubmitButton sends data to database. The Adding of a row works to add the row to the gridview, but it won't add a second or third and so on, only adds the 1. SubmitButton belives the DataTable that GridView is databound to is null and won't send anything to the database. How can i get the datatable to persist between the two update panels? Do i use Sessions as my storage location? Page


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I have a DataTable of available time slots. I have another DataTable of reserved time slots. I need to remove from the list of available slots the ones that have been reserved. The blocks are in 15 minute increments, but one of my problems is that the reservation can be longer than 15 minutes. I've had some luck removing one or two, but not all of the required columns.

Here's my code (it doesn't work right now).


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In terms of set, you can say that record which are in 1st datatable but not in 2nd DataTable.

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