I have a string which can be empty if its not empty it is containing a xml document. The problem is null values are allowed in this dataset column of DataType System.String. Error Message:this.MetaData' threw an exception of type 'System.Data.StrongTypingException' base {System.SystemException} = {"The value for column 'MyData' in tabl...
I have a DataGridView corresponding to a table which has an identity column and the primary key is also set to this column and a button (a SQL database). I've added the dataset of database to project. There is a empty table (DataGridView) in front of user and he/she can edit (update) this DataGridView; for example edit just one cell and...
there is a datagridview corresponding to a table of some database. this database has a identity (auto-incrementing) column named "id".this column is primary key,also. user just see a blanked and empty datgridview.he/she can modify this table(datagridview) for example add new row,remove it,edit(update)one cell and can do every possible mo...
Strongly-typed DataTables support "nullable" field types, except that the designer will not allow you change the setting to "allow nulls" for any value type fields. (ie: String types allow nullable, but int's do not). The workaround is to call IsMyFieldNull() any time you want to get Myfield. If you access MyField when it does contain ...
Hello, I have this find condition pulling from my model that currently looks like this. @major_set = Interest.find(:all, :conditions => {:id => 1..21}) I'd like to add some more individual ids that I've just added which are like 120...130. I tried to do... @major_set = Interest.find(:all, :conditions => {:id => 1..21, 120..130}) ...
I'm trying to convert the response I'm getting from Web Service into a DataSet so I can bind it to a GridView. The response is already serialized. ...
In the asp.net webservice, I have a static dataset that loads data (synchronized) upon first time access. However, when IIS recycle the app pool, I have exception thrown because of "Collection was modified; enumeration operation might not execute." The recycle will start the new process, which will create new static dataset, the request...
I can check for a DBnull on a data row using any of the methods. Either by using if(dr[0][0]==DBNull.Value) //do somethin or by doing if(dr[0][0].ToString().IsNullOrEmpty()) //do something In Both Cases I will be getting same result. But Which one is conecptually right approach. Which was will use less resources ...
What is the importance of using XMlDataDocument with dataset. It is getting me bit confused Can some one please explain the importance of this? thanks ...
I have a XML file that I need to populate multiple SQL tables, and I was wondering what the best way to do that is. I was thinking dataset, or xslt but I honestly not sure. Here is my generated XML (part of it) <?xml version="1.0" encoding="utf-8" standalone="yes" ?> - <!-- Created: 8/3/2010 12:09:15 PM --> - <Trip> - <TripDetail...
Hi, I am trying to export a dataset to excel from asp.net page method(webmethod) using the following code. [WebMethod] public static void ExporttoExcel() { DataSet ds; productfactory pf=new productfactory(); ds = pf.getproducts(); HttpResponse response = HttpContext.Current.Response; // f...
Hi all, I am using the following code to export a datset to excel sheet. [WebMethod] public static void ExporttoExcel() { DataSet ds; productfactory pf=new productfactory(); ds = pf.getproducts(); HttpResponse response = HttpContext.Current.Response; // first let's clean up the response.o...
Sorry, the question title is somewhat vague, so here's a working example. I have a table into which each user (userid) gets a value every few days. I want to find the last of those values for each user, broken out by month, and count their number into a range. Here's an example table and representative data: CREATE TABLE `datasource` ...
I try updating my database after updating the dataset, but evenafter calling the data adapter's update function the underlying database doesn't change. I used SqlCommandBuilder and it still wouldn't update. Once I have the GUI open I can submit and search for values in my dataset but once I close it then re run it, all the changes are go...
Hello, I have a little exercise. I need to load data from the DB (XML file) into a dataset or something else, and use queries. what is the simplest way to do it? I want to use a Dataset GUI to make a queries. thanks, Dani. ...
Help I am attempting to create some report on a report server model. I need to create a text type DataSet, using sql. Once I have written the SQL and click on OK it attempt to load back into Design>>Data view, but fall over. It show the below error A connection cannot be made to the database. Set and test the connection string. Add...
How can I search rows in a datatable for a row with Col1="MyValue" I'm thinking something like Assert.IsTrue(dataSet.Tables[0].Rows. FindAll(x => x.Col1 == "MyValue" ).Count == 1); But of course that doesn't work! ...
Hello: I developed WPF / XAML applications that invoke objects (functions or Web services) which retrieve data from various sources (SQL Server DB, Active Directory, Oracle DB, SAP RFC, XML files, flat files, etc.). These objects always return Datasets, which then bind to datagrids for displaying information to the user, additionally ...
Hi I am doing a project in ASP.NET that at one point searches a SQL database for a postcode using Datasets: string postcode = "%" + searchTerm.Trim().Replace(' ', '%') + "%"; SearchDataSet.SearchCustomerTableDataTable custTable = custAdapter.GetDataCustPostcode(postcode); The GetDataCustPostcode runs: SELECT * FROM CustomerTable WHE...
Hello, I have a datagridview that is bound to a dataset I defined the table and the columns, how I can programmaticlly insert data to it? I did this http://msdn.microsoft.com/en-us/library/5ycd1034%28VS.71%29.aspx but it did not show the data in my DataGridView !!! ...