ADO.NET :: Find Rows In One DataTable From Another DataTable And Remove Them

Sep 9, 2010

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).


View 1 Replies

Similar Messages:

DataTable.Rows.Find Returns Null

Feb 13, 2010

I have a DataTable for which a PrimaryKey constraint has been set to be a combination of an integer column and a datetime column. When I try to 'Find' a row by saying,


I get a null value. iContainerIndex has been defined as an object array of size 2 with the integer ID and date values in it.

When I set a breakpoint in my code, I see that the very same values are present in the datatable.

If I try to execute, DataTable.Select() method with the integer column filter, I get a result - but returns no result when called with the date column filter.

What am I doing wrong here? The very same DateTime value is present in the datatable.

View 1 Replies

ADO.NET :: Find Duplicate Rows In DataTable Using LINQ Via VB.Net Syntax?

Jan 15, 2011

I have made a custom DataTable

Dim dt As New DataTable("RizPardakht")
Dim RowID As New DataColumn("tbz_GatiPardakhtID")
Dim FishNo As New DataColumn("tbz_FishNo")


View 8 Replies

Error "DataTable Is An Ambiguous Reference Between System.Data.DataTable And Microsoft.Office.Interop.Word.DataTable"

Jan 20, 2011

'DataTable' is an ambiguous reference between 'System.Data.DataTable' and 'Microsoft.Office.Interop.Word.DataTable'

View 3 Replies

C# - Find DataTable By DataTable.Id ?

Nov 14, 2010

There has to be an easy answer:I want to loop through multiple datatables... example:

for (int i = 1 ; i < 7 ; i ++ )
DataTable dt = (DataTable) "dt" + i.toString();
// do something with DataTable dt1 as DataTable
// ie...
int x = dt.Rows.Count

The above code obviously does not work.. but how do you find a DataTable like you do FindControl with WebControls??

View 1 Replies

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.

View 1 Replies

C# - How To Remove A Certain Row From DataTable

May 16, 2010

How do i achieve simple sql query like

delete from Users where userCity='Munich'

with DataTables ?

p.s. without using Linq or something like that simply because i do not use it though project.

View 3 Replies

Controls :: How To Add And Remove Columns In Datatable

Feb 25, 2016

I want to add and remove columns on specific conditions. how it's possible.

Alert: Add and remove  not Hide and show...

View 1 Replies

Pass Datatable To The Mvc View Error / CS0246: The Type Or Namespace Name 'DataTable' Could Not Be Found

Sep 28, 2010

I was reading: [URL]

But I have give a compilation error:

CS0246: The type or namespace name 'DataTable' could not be found (are you missing a using directive or an assembly reference?

View 1 Replies

DataSource Controls :: How To Copy The Data From One Datatable To Another Datatable Based On The Schema

Jan 11, 2010

i have the dataset with one table.Table contains three column like 'Name','Location','Pin'.I would like to move the data from another table based on schema.

View 2 Replies

Forms Data Controls :: Set A Column In A DataTable To Be A Primary Key For An Existing Datatable

Apr 2, 2010

If I am passed a datatable and I cant change the column there anyway to set an existing column to a Primary key so I can easily Find() the row I am looking for?

View 1 Replies

Data Controls :: Copying Specific Records From One Datatable To Another Datatable

Aug 22, 2012

im trying to copying specific record from one datatable to another datatable i used below code

public System.Data.DataTable selectspecificdatarow(System.Data.DataTable dtg, int count, int startindex)
System.Data.DataTable dtn = dtg.Clone();
for (int i =startindex; i < count; i++)


its taking too long time in cloneing is there any better way to do this task which is Time effecent

View 1 Replies

C# - Sum Selected Rows In Datatable Only ?

Aug 11, 2010

I have a datatable which has an amount column & a status column.I want to sum only those rows who have status '1'. How to do this ?I am summing the column via datatable Compute method.

View 1 Replies

C# - Updating Rows In DataTable?

Nov 22, 2010

I'm trying to update fields in a DataTable. The field I'm trying to edit is a date, I need to format it.

foreach (DataRow row in dt.Rows)
string originalRow = row["Departure Date"].ToString(); //displays "01/01/2010 12:00:00 AM"
row["Departure Date"] = DateTime.Parse(row["Departure Date"].ToString()).ToString("MM/dd/yyyy");
string newRow = row["Departure Date"].ToString(); //also displays "01/01/2010 12:00:00 AM"

How come this isn't getting updated?

View 2 Replies

DataSource Controls :: Remove / Hide Duplicate Value In Datatable?

Feb 23, 2010

how can i only display the name columne once in the repeater, when more than 1, then hidden the label
now my table are:

name col. age
mary 11
mary 16
Sam 18

now i would like to hidden the duplicate name as below:

name col age
mary 11
Sam 18

how can i manage the datatable to prevent duplicate name to bind to repeater.

View 2 Replies

C# - How To Join Two Datatable Datas Into One Datatable To Show In One Gridview

May 24, 2010

how to join two datatable datas into one datatable to show in one gridview

i.e in 1 datatable i have username and pwd and in another datatable i have that user details. how to show all these in one datatable to get those values display in gridview(

View 4 Replies

How To Keep The Rows Ordering Of Datatable Unchanged

Jul 6, 2010

I have a datatable with the ordering of its DataClassIndex column before editting:

DataclassIndex 0 1 2 3 4

When I start modifying some other cells in this datatable, the ordering of DataClassIndex column changes to something like this

DataclassIndex 3 4 2 1 0

How can I modify a datatable content without altering the original order of the datatable.

View 3 Replies

Datagrid With 2 Columns That Have Different Datatable Rows?

Feb 9, 2010

i want to make a datagrid with 2 columns and many rows the columns i want to have databinding with a datatable

i want the 1 row 1 column of datagrid have data from 1 row of datatable
i want the 1 row 2 column of datagrid have data from 2 row of datatable
i want the 2 row 1 column of datagrid have data from 3 row of datatable
i want the 2 row 2 column of datagrid have data from 4 row of datatable

i use something like this


but i have two times the same in tha datagrid left and right

View 28 Replies

C# - How To Select Top Of Rows From A Datatable/dataview

May 7, 2010

How to select top n rows from a datatable/dataview in I am using the following code by passing the table and number of rows to get the records but is there a better way.

public DataTable SelectTopDataRow(DataTable dt, int count)

DataTable dtn = dt.Clone();
for (int i = 0; i < count; i++)
return dtn;

View 2 Replies

Export DataTable To CSV File - More Than 65,536 Rows

Mar 1, 2010

Exporting DataTable data to CSV file. It is working fine as expected as long as the export records are less than 65,536. When the records are more than 65,536 , only 65,536 records are shown in CSV file (remaing records are not shown). When the export is done(with more than 65,536 records), opening the file shows below message window. File is not loaded completely. When the Ok button is selected, below text displayed...

This message can appear if: You are trying to open a file that contains more than 65,536 rows or 256 columns. To fix this problem, open the source file in a text editor such as Microsoft Word. Save the source file as several smaller files that conform to this row and column limit, and then open the smaller files in Excel. If the source data cannot be opened in a text editor, try importing the data into Microsoft Access, and then exporting subsets of the data from Access to Excel. You are trying to paste tab-delimited data into an area that is too small. To fix this problem, select an area in the worksheet large enough to accommodate every delimited item.

Notes: You can not configure Excel to exceed the limit of 65,536 rows and 256 columns. By default, Excel places three worksheets in a workbook file. Each worksheet can contain 65,536 rows and 256 columns of data, and workbooks can contain more than three worksheets if your computer has enough memory to support the additional data. Solution:- Seems like here is the suggested solution. But it takes ages to export and show data. An export is done about 15mins ago, still it is doing that. Has anyone managed to find/resolve this issue?


View 4 Replies

DataTable Doesn't Store New Rows?

Mar 16, 2010

In my simple starter asp page I create a DataTable and populate it with two rows. The web site allows users to add new rows. My problem is the DataTable doesn't save the information. I've stepped through the code and the row gets added but the next time a row is added it's not there, only the original two and the newest one to get entered.

I have gotten around this, in an inelegant way, but am really curious why the new rows are being saved.

My code:

protected void Page_Load(object sender, EventArgs e)
_Default.NameList = new DataTable();
DataColumn col = new DataColumn("FirstName", typeof(string));
col = new DataColumn("LastName", typeof(string));
DataRow row = _Default.NameList.NewRow();
row["FirstName"] = "Jane";
row["LastName"] = "Smith";
row = _Default.NameList.NewRow();
row["FirstName"] = "John";
row["LastName"] = "Doe";
protected void AddButton_Click(object sender, EventArgs e)
DataRow row = _Default.NameList.NewRow();
row["FirstName"] = this.TextBox1.Text;
row["LastName"] = this.TextBox2.Text;
_Default.NameList.AcceptChanges(); // I've tried with and without this.

I've tried saving them to GridView control but that seems like quite a bit of work. I'm new to ASP.Net but have done windows programming in C# for the last two years.

View 3 Replies

C# - Check Whether Datatable Contains Any Matched Rows?

Aug 11, 2010

I am using Compute for summing up a datatable which has a condition. Sometimes, there are no rows inside the datatable matching my criteria so I get an exception on ComputeObject cannot be cast from DBNull to other types.Is there a way to check/filter the datatable to see if it has the desired rows, if yes only then I apply Compute.

total = Convert.ToDecimal(CompTab.Compute("SUM(Share)", "IsRep=0"));

View 2 Replies

Looping Through A Returned Rows In DataTable

Jul 31, 2012

I have as script that runs a stored procedure to fetch a comment along with it's id. There are multiple comments and I want to display them but I am having problem with display all the records. Here is my code:

Using con
Using sda As New SqlDataAdapter()
cmd.Connection = con
Catch ex As Exception
Response.Write("Error" & ex.Message)


How do I make it so that the returned results will be like this:

                 6 First Comment

                 7 Second Comment

View 1 Replies

Web Forms :: Adding Rows To Datatable

Dec 6, 2011

I have added a row to a datatable and displayed this datatable by binding it to gridview.. Later if i add another row to the same table, the data table displays only the recently added row.. I need to display the previously added row along with the newly added row.. How to do this?

View 1 Replies

Web Forms :: Copy Rows From DataTable To Another?

Feb 26, 2012

I want to copy rows from one datatable to another.

View 1 Replies

Copyrights 2005-15, All rights reserved