Adding An Extra Column In A Datatable
Jun 21, 2010How do you add an extra column in a datatable which will be used for another query
View 3 RepliesHow do you add an extra column in a datatable which will be used for another query
View 3 Repliesi have a sum column in my datatable and want to add the values?
is compute a good method to use?
How can i add same fields for columns in a datatable. I wan to make a datatable which repeate column name of same type multiple times, but dot net dont allow me to add that, but i want to do that hw can i do that?
table.Columns.Add("S.NO", typeof(int));
table.Columns.Add("DC", typeof(string));
table.Columns.Add("DC", typeof(string));
table.Columns.Add("DC", typeof(string));
table.Columns.Add("ST", typeof(string));
table.Columns.Add("ST", typeof(string));
table.Columns.Add("AD", typeof(string));
table.Columns.Add("AD", typeof(string));
I'm trying to figure out how add extra logic to this derived column expression:
LEN(TRIM(pup_date)) == 0 ? NULL(DT_DATE) : ((DT_DATE)(SUBSTRING(pup_date,5,2) + "-" + SUBSTRING(pup_date,7,2) + "-" + SUBSTRING(pup_date,1,4)))
If there's a 0 in the field the code inserts a null. Otherwise it inserts a date. How can I change this to insert a NULL if a question mark "?" appears in the column?
This is what I tied using the OR operator but it's not working:
LEN(TRIM(pup_date)) == 0 || LEN(TRIM(pup_date)) == "?" ? NULL(DT_DATE) : ((DT_DATE)(SUBSTRING(pup_date,5,2) + "-" + SUBSTRING(pup_date,7,2) + "-" + SUBSTRING(pup_date,1,4)))
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?
View 1 Replieshow to setup a edit option in the drop down...
Example:
I have a drop down for 6 colors...and user didn't find the color which he wants...can I place a last option as new or Edit or something which allows the user to enter the color he wants in the dropdown or change that drop down to textbox to enter data... If this is possibly then how can i capture those values in the code behind...
I have a code like the following:
Code:
<table>
<col width="50%" />
<col width="50%" />
<tr>
<td>
</td>
<td>
blah blah
</td>
</tr>
</table>
When i switch to design and get back to source view it added the colgroup so my code looks like this:
Code:
<table>
<colgroup>
<col width="50%" />
<col width="50%" />
<tr>
<td>
</td>
<td>
blah blah
</td>
</tr>
</colgroup>
</table>
how to make the IDE stop adding these extra elements? i changed the Target Schema to all possible combination and it didn't help.
i want to add an extra header to my grid.. i want to do the following..
[Code]....
knowing that the data source of this grid is dataset
Is there built in methods into .net framework to do the following:
Get role GUID from user name/user GUID
Get role name from role GUID
So far I have been sending queries to the asp_roles and asp_users tables to obtain that information and I'm wondering if there is a nicer way of doing this?
I have the following methods that I store in the ASPUtilities class:
getRoleGUID(guid userGuid) { LINQ joins }
getRoleGuid(string userName) { LINQ joins }
getRoleName(guid roleGuid) { LINQ joins }
EDIT:
I have just looked into extending SQLMembershipProvider examples.
Few examples completely override the SQLMembershipProvider, but I think what I'm interested is just adding few extra methods to deal with the roles by using LINQ. Is this feasible?
I'm getting a blank column when switching to another page using the default pager in the telerik radgrid. As data for each row, it shows the type of data i am using for the rows (SearchRecord)
Anyone have any clues as to why this may be happening? It doesn't show up on initial population of the grid, but only when I do paging. My columns are built dynamically but i confirmed that when my columns are built, they are the correct number.
I have a gridview with the following columns pid Location
I would like to add an extra column called quantity, that could be used to get a user input. How do i go about doing that? See illustration below
pid Location quantity
I am facing a problem with grid view footer template.. I just want to add a message like hello world in the bottom of the grid view as a seperate row... Right now I am using footer for this..but If the size of footer text increases the width of column which holds that will also increasing.. Is there any way to add a label in the bottom of the grid like
Ex: The number of Students is 200
This will needs to come in the bottom of grid without changing the size of columns..
I want to get extra column with links in my gridview which changes on click and updates my database
View 8 Repliesi have a datatable with several columns and rows. now i want to copy the last column fully (all rows) and create the new column with that values.
it means last column values sholud be moved to new column (now this is the last column).
I am grabbing an XML feed an throwing it into a dataset. I am looping through the datatable that is in the dataset and adding a column to the datatable (Distance) that is the result of a calculation. What I then need to do is sort the dataset on the new column (Distance) I added, but it is not working... Here is a sample of my code.
[Code]....
I have some code that splits a session into strings by a -
My session looks something like this 123-456-789- and I split it like this
Dim MyString As String() = Session("MySession").Split("-"C)
And i've got a some code like this
Dim x as Integer
For x = 0 to MyString - 1
Response.write("Ref: " & MyString(x) & "<br>")
Next
This writes the code like this
Ref: 123
Ref: 456
Ref: 789
Ref:
So it's adding an extra Ref where it shouldn't be because there is no data after the last -
Is there a way to stop this adding in the extra one?
I have created a gridview based on an SQL Datasource. The grid view contains several columns(fields) one of which is called "Amount". In the footer of the gridview their is a field that contains the sum of all of the values contained in the "Amount" field.By problem is that in instead of getting the value of the Amount displayed in the "Amount" field of each row, I am getting a '0' (Example: 0 25.78 when I should just be getting 25.78. There is a space between the '0' and the '25.78'.
Code is as follows:
<asp:TemplateField
HeaderText="Amount"
SortExpression="Amount"> [code]....
How do I go about adding a ButtonColumn to a DataTable.
I am basically using a DataTable as the DataSource of a DataGrid and need to add a ButtonColumn to the DataTable so that when I DataBind it to the DataGrid it all works.
Although when I try
dt.Columns.Add(buttonColumn)
This is not allowed. It has to be a basic DataColumn.
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 RepliesI have a function that converts a .csv file to a datatable. One of the columns I am converting is is a field of names that have a comma in them i.e. "Doe, John" when converting the function treats this as 2 seperate fields because of the comma. I need the datatable to hold this as one field Doe, John in the datatable.
Function CSV2DataTable(ByVal filename As String, ByVal sepChar As String) As DataTable
Dim reader As System.IO.StreamReader
Dim table As New DataTable
Dim colAdded As Boolean = False
Try
''# open a reader for the input file, and read line by line
reader = New System.IO.StreamReader(filename)
Do While reader.Peek() >= 0
''# read a line and split it into tokens, divided by the specified
''# separators
Dim tokens As String() = System.Text.RegularExpressions.Regex.Split _
(reader.ReadLine(), sepChar)
''# add the columns if this is the first line
If Not colAdded Then
For Each token As String In tokens
table.Columns.Add(token)
Next
colAdded = True
Else
''# create a new empty row
Dim row As DataRow = table.NewRow()
''# fill the new row with the token extracted from the current
''# line
For i As Integer = 0 To table.Columns.Count - 1
row(i) = tokens(i)
Next
''# add the row to the DataTable
table.Rows.Add(row)
End If
Loop
Return table
Finally
If Not reader Is Nothing Then reader.Close()
End Try
End Function
How do I get the column header of a datatable in a gridview which is displayed in a gridview I created. I need to get it so that I can use it as comparison.
View 1 RepliesThis is my datatable
[Code]....
I want to localize the columns names. Can you tell me how can I do this? I localized my .aspx pages, but I don't know how to localize the text in .cs files.
I have a dataTable filled with data.
And I want to insert new column into same datatable without affecting original data.
I need to add rows to an existing (maybe) datatable in a dataset that combines the IIS6 index search with my own sql table. I keep getting object reference errors.
[Code]....
I'm looping through an ArrayList and creating a column in a DataTable from each field. One of my fields is a DateTime field, and I've noticed that when I create the columns, it's being changed to a String, but I need it to still be a DateTime field for sorting. I'm trying to do this, but it's not quite working.
[Code]....