Update Qty Column In A Session Datatable?
Nov 14, 2010I have a Datatable store in the Session. This Datatable has a column call Qty. I have one button on the page that will update the Qty. How can I update my DataTable Qty column?
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I have a Datatable store in the Session. This Datatable has a column call Qty. I have one button on the page that will update the Qty. How can I update my DataTable Qty column?
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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 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.
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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:
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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?
Its related to datatable in gridview store in session and then session retrive and store to database. basically i am using gridview here creating new row for button click and these row adding untill user's last entry then submit all these entry to database. so i want to use session variable to store this data temporarily and after final entry user click on submit button and all data shold be save in db.
View 9 RepliesI have a table converted from Access and the identity keys were lost. Now I need to make the id column the identity column, but it already has a lot of null values, how do I auto generate integer values for the null rows? The row ids are incremented, so if there is a way to auto increment the ids
View 7 RepliesI am confused about how to reference objects in session, how to update, and copy.
if I create
MyObject obj = new Object ();
then
Session["object"] = obj;
MyObject temp = (MyObject)Session["object"];
If i change something on temp, will the object in session be updated? do i need to follow changes with Session["object"] = temp?
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
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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.
how can i sort the data in col of datatable or other way to sort
View 7 RepliesI 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?
How do you add an extra column in a datatable which will be used for another query
View 3 Repliesi have list box, in that list box have some fields(SQL Table fields) in run time i arrange the fields(based on my requirement order) , based on the list i want to change the columns in data table dynamicaly. how i change the columns in the datatable.
View 6 Repliesi have a sum column in my datatable and want to add the values?
is compute a good method to use?
I have string value in the column of datatable.I would like to assign seq no to different value.if they have the same value, I would like to assign the same seq no.if there isn't has the value in the column, then assign a new seq no.how to do this?for example:
district no. district
1 hong kong
2 germary
3 canada
1 hong kong
using vb.net 2005.
I'm trying to a byte array column to a table but getting an exception:
<error>
datatype argument cannot be null
</error>
The code I have is:
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Does anyone know the correct syntax for this?
I have a function that checks for a username and if it finds the username it will allow the user to update the user, there are 3 main columns: Name,Age,isFemale. I have the enduser supply the information and then I try to update the record but I get a sql error for "not a valid" column.console app:
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I pass the spIsFemale by using an enum, here is the Person Class with function.
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I get an error that column isFemale is not valid. The isFemale column is a bit type. If it's a 1, it's a female, if 0 male. this is more of a test area and I'm trying to update records or create new one's if the name does not exist.II am new to C # and I am just trying to learn new ideas and methods within C sharp.
Im trying to retrieve a datatable that I put into a session variable, however when i do it apears that there are no columns... I have done this before in VB.NET, I'n now using C#, and it worked perfectly, and as far as i can see there is no change in the code other than the obvious syntax changes.
EDIT: The dt (in part 2) variable has the right data when i look in the data visulization window, but i have noticed that the other properties associated with a datatable are abscent. When i hover over a normal looking datatable with my mouse it looks like the following: " dt ----- {System.Data.DataTable}" but in the class im working on it just looks like "dt ----- {}". Also, after I return the session variable into the dt I clone it (dtclone = dt.clone(); ) and the clone is empty in the data visulizer.... what on earth!
EDIT 2: I have now also tried converting the first datatable to a dataset, putting this in the session variable, and recoverting it back to a datatable in the class. Am starting to wonder if it is a probelm with: dt.Load(sqlReader); The data does appear after this step though in the dataset visualiser, but not after being cloned. Code below.
1) SQL command in a webhandler, the results of which populate the datatable to be put into the session variable.
DataTable dt = new DataTable();
SqlDataReader sqlReader= default(SqlDataReader);
SqlDataAdapter sqlAdapter = new SqlDataAdapter();
sqlReader = storedProc.ExecuteReader(CommandBehavior.CloseConnection);
dt.Load(sqlReader);
System.Web.HttpContext.Current.Session["ResultsTable"] = dt;
2) Part of the code in a class which performs calculations on the table:
DataTable dt = (DataTable)HttpContext.Current.Session["ResultsTable"];
I've got a DataTable that I'm appling to a session variable on inital page_load.
I need to check whether that Session Variable when the page is returned to - ie Not isPostback.
I can do If Session("var") = Nothing Then, but the problem with that is, if the Session variable already has the DataTable applied to it, it will throw back an error stating that
Operator '=' is not defined for type 'DataTable' and 'Nothing'.
How can I get around this?
I have a DataSet comprised of two DataTables. One of the DataTables is further comprised of the results of two different SQL calls. I need to alphabetize the results of those SQL calls. After the seconds set of results is added to the DataTable I tried the following but the end result (displayed on the page) did not alphabetize the returned results. There was no error. Can anyone advise me please. 'programs' is the DataTable name, title is the column name.
programs.DefaultView.Sort = "Title ASC";
I am getting a datatable from the SQL Server. In SQL Server the column headers are fine (mix of Capital and Small Letters). But when i am getting it in the front end, all the column names are in lower case. How can i get the column names in original Case.
View 3 Repliesi use a datatable to populate my gridview, how do i retrieve database to datatable's column?
View 3 Repliesi have a column seq_no in datatable. if the column with data 2,4,5 how can i have the max number of the column. C#
View 5 Replies