Web Forms :: How To Check Distinct Val In Datatable

Jan 28, 2010

how can i check distinct val in col_1 of datatable and assign seq no to each distinct val of col_1 to col_2?

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C# - How To Get Distinct Records In Datatable

Jul 20, 2010

I am using C# + VSTS 2008 + .Net + ASP.Net + IIS 7.0 + ADO.Net + SQL Server 2008. I have a ADO.Net datatable object, and I want to filter out duplicate/similar records (in my specific rule to judge whether records are duplicate/similar -- if record/row has the same value for a string column, I will treat them as duplicate/similar records), and only keep one of such duplicate/similar records.

The output needs to be a datatable, may output the same datatable object if filter operation could be operated on the same datatable object.

What is the most efficient solution?

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ADO.NET :: How To Get The Distinct Value Form DataTable Using LINQ

Oct 27, 2010

I would like to get the distinct value form DataTabel using LINQ.

For example my sample table,

[code]....

1. How to get the distinct Country from Country you like column and the return records as Array or DataTable? (I want only India,USA,UK,Germany )

Is there any way to filter the record values using LINQ?

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ADO.NET :: Distinct Values From A Column In Datatable?

Sep 21, 2010

I have a datatable dt with 4 columns. I want to retrieve only distinct values from column1 of datatable.

How can I achieve this using c# code?

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Linq To DataTable Not Producing Distinct Values?

Oct 19, 2010

I have a datatable which has been dynamically generated from FoxPro tables using a UNION Select statement. e.g.

SELECT * FROM x UNION SELECT * FROM y UNION SELECT * FROM Z ORDER By v_alue1

This produces a datatable with about 100 rows, each containing many fields, one of which is c_olor. From this datatable, I would like to select the distinct colors and then output in a dropdown.

I have a public class Color which just has one property which I can then use as the DataTextField and DataValueField for the dropdownlist

[code]...

However this never results in the distinct colors.

I have searched and searched for what I am looking for, and this seems to be one of the methods to produce a distinct set of results, but this and the others do not work.

My reasoning behind getting the colors this way, is that I need to get various other distinct values from the same UNION SELECT datasource, so would just do one DB call, cache the results, and then just used this cached datasource to retrieve all my distinct values.

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Using Select Distinct On An Already Created DataTable Object?

Nov 16, 2010

I have an already created DataTable object which i am using for my girdview (asp.net) i also need to bind a column of that object to a DropDownList. The datatable has the correct details in the column but the column contains more that 1 of the same name in the column - hence I would love to just do some kind of SELECT DISTINCT on the datatable and copy it to a new datatable for use with binding the dropdown.

This would allow me to save resources by making another trip to the database.

Here is an example, the current datatable has a column called items and in this column has the following entries

1
1
1
1
5
5
6

And of course i need only unique items for binding to my dropdown, hence i need the following data

1
5
6

Of course i don't want to change the original datatable object but rather make a copy of it will the new details.

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SQL Server :: Query To Return Conditional Counts Both Distinct And Non Distinct?

Sep 30, 2010

I have the following table structure:

[code]....

The following query returns the default recordset:

[code]....

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Select Distinct And Include Non-distinct Columns?

Apr 20, 2010

I would like to select a distinct query based on three fields and display the rest of the fields. For example,

I have firstname, lastname, address, city, state and zip, but I only want to use the distinct on these fields first and last name. However when i use the distinct function I get a distinct on all the selected rows. I just want to distinct firstname and lastname and display the other fields. for example,

Mary Smith New York
Mary Smithy New York
Mary Smith Maine

I would like the result to be:

Mary Smith New York
Mary Smithy New York

I don't care about Mary Smith Maine, because i am only using the distinct for "Mary Smith" firstname and last name and showing the city.

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Forms Data Controls :: Update Datatable When User Click Check Box

Jun 3, 2010

I have gridview wich bind with dynamic datatable.

<asp:GridView ID="grdCountries" runat="server" AutoGenerateColumns="False" ShowHeader="False" OnRowDeleting="grdCountries_RowDeleting" DataKeyNames="country_id" BorderStyle="None" GridLines="None">

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Check If Row With Particular Id Exists In Datatable?

Mar 20, 2011

i have two datatable, while adding rows in second datatable, i want to first check whether the id in the second datatable matches as in the first datatable, if not only then it should be added in the second datatable, else it should display a message...

i dont have any Primary Key defined on any column, so the rows could be repeatative.

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ADO.NET :: Check If DataTable Row Is Empty?

Oct 5, 2010

Im using "string user = Database.GetMostRecentReply(id).Rows[0][2].ToString();" to get the username from the most recent reply in my forum.

But how do I check if the row is empty? Im using a try catch at the moment, but there must be a better way to do this.

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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"));

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C# - Check For Existing Values In Datatable?

Dec 17, 2010

if (dt.Rows[i]["Code"] == code)
{
Label lblLang = (Label)(((e.Item as GridItem).FindControl("lblLang") as Label));
lblLang.Visible = true;
}
else
{
}
}

I am adding a new language Fr-FR in the code above. fr-FR already exists in my DB's Language Table. I do not want to add duplicate values in my table. There should be only one fr-FR.

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Data Controls :: How To Check Whether DataTable (DataSet) Has Rows In C#

May 7, 2015

DataSet ds = new DataSet();
string qry = "select Name,Section,present from presentdays where id='" + TextBox1.Text;
qry += "'";
ds=mvl.GETDS(qry);
foreach (DataRow dr in ds.Tables[0].Rows)
{
TextBox2.Text = dr["present"].ToString();
TextBox12.Text=dr["Name"].ToString();
TextBox13.Text=dr["Section"].ToString();
}

there is no data in id='1'i need to throw the error as there is nothing is found in id='1'

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Data Controls :: Check If Particular Value Exists In DataTable (DataSet) Using C#

May 7, 2015

check if variable exists in dataset ?

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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 datatable.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 work.how 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++)

[code]...

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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:

[Code]....

//Bengt

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SQL Server :: How To Get Distinct Column Name Which Are Having Distinct Values In The Column

Feb 4, 2011

I have one table(tableName is getDetails and having three column ID, Name, City)

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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'

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Web Forms :: Distinct Arraylist Value Using C#?

Feb 22, 2010

how to distinct arraylist value using c#?

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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 structure..is there anyway to set an existing column to a Primary key so I can easily Find() the row I am looking for?

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Web Forms :: Distinct Values In DropdownList?

Jul 15, 2010

i'm binding data to ddl from database.i'm selecting one column from database table to bind.In that column there may be items with same name.but when selecting in ddl there must be no same values.

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Web Forms :: How To Use Distinct When Working With ROWNUMBER In SQL Server

Jun 18, 2012

This is my last thread [URL] .... 

This sp show duplicate row yet, what can i do?

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Web Forms :: How To Bind Distinct Values To DropDownList From DataSet

Oct 6, 2010

I'm trying to bind a dataset (where the data is coming from a webservice) to a dropdownlist; the problem is that I'm getting duplicates in the list... how can I display distinct values only:

[Code]....

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Forms Data Controls :: Distinct Table By Date And Sum Results

Mar 15, 2011

i have table that trace views of my page. every row has the id, date view (dd/mm/yyyy hh/mm/ss) how can i distinct the data into gridview (or something else) and display only the days (01/03/2011, 02/03/2001, 03/03/2011) and to sum the numbers of views (01/03/2011 1,290 views, 02/03/2011 867 views.....)

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