Forms Data Controls :: Gridview Add Row From SQL Datareader?
Feb 10, 2011
I have created column headings for the gridview dynamically and now I want to fill the gridview with data that is retrieve through a stored procedure. If set gridview.datasource = cmd.ExecuteReader, get the table headings as well. So if guest I need to loop and add data one row at a time. To create the headings I used the following example:
Dim EmailRecipientID As New BoundField
EmailRecipientID.HeaderText = "Email Recipient ID"
gvEmailRecipient.Columns.Add(EmailRecipientID)
I know its quite easy when Gridview is bind with dataset but Is there any possibility to get it done through datareader object. If am looking to get the delete and update functionality down through store procedures that wound be called upon action.
Error is:- The data source does not support server-side data paging.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NotSupportedException: The data source does not support server-side data paging.
Source Error: Line 34: con.Open(); Line 35: GridView1.DataSource = cmd.ExecuteReader(); Line 36: GridView1.DataBind(); Line 37: con.Close(); Line 38: }
I have a field in sql select statement that I want to read to a datareader and convert that value from the field to a word to display in a datagrid. i know that sounds confusing but let me give you an example.
I have a field called duration_interval in a sql table and it has data values of 'ww' for Weeks, 'dd' for Days and 'mm' for Months. When I load the Datagrid I want the field for this value to say Weeks instead of ww, how do I convert the 'ww' value to show the word Weeks in the datagrid? Below is the select statement and the code for the datareader I have on my page now that isn't working correct:
- i have two drop down lists- ddl_SelectClient, ddl_SelectApplication
- when a client is selected in ddl_SelectClient, i have to show the list of the clients applications in ddl_SelectApplication
- i have written the below code in the ddl_SelectClient_SelectedIndexChanged routine to do the same
- i am getting the error("Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack") in the catch block when the ddl_SelectApplication gets binded
I have no problem when paging my FormView, the dropdownlist does not read the next record and keep the value of the first loaded record? All other textbox control behave normally and move from record to record excepted the ddl??Here the code.
Public Sub DoData() Dim myConn As SqlConnection = New SqlConnection(ConfigurationManager.ConnectionStrings("LocalSqlServer").ConnectionString) Dim myCommand As SqlCommand = New SqlCommand("SelectSupplier", myConn) myCommand.CommandText = "SelectSupplier"
I'm having a method that exports content from the database to excel files. The method taks as paramaters a DataReader param and a int param - the number of rows. For the number of rows i'm using a dataset, wich i fill using the same query as for the datareader. So I'm executing it twice... Is there a way I can avoid that? get the number of rows from the datareader?
i have a datareader who read from data field from sql server, this field is datetime format now, when this field is null it returns 01/01/1900!! how can i manage it without if or some check, is there a property in datareader or sqlserver properties who i can return null value from datetime field?
I am getting an error that an open DataReader associated with this Command, when I'm not using datareader(though probably executereader() is the same thing) how would I close this if I don't have a datareader present?
using (SqlConnection conn = new SqlConnection(ConnectionString)) { SqlCommand cmd = new SqlCommand("spSelectAllTypes",conn); cmd.CommandType = CommandType.StoredProcedure; [code]...
I just want to be able to databind a bunch of dropdownlist in one open connection. (before I had multiple open and closes for each control)
i am having the problem that i am using datareader to get contents in my asp.net page.But the page takes a lot of time to load.How to decrease the loading time of the apage and increase the performance of my page.
I am getting the following error when i am trying to assign values to controls on form via datareader, i know i got one row. but this particular field has no data in it.
I do have lot of other forms where i use the same style
getting this error: invalid attempt to read when no data is present
on this line: If gDatareader("CutoffDate") Is DBNull.Value Then
I have put a SQLDataSource on my page and everything is adjusted and it works properly. I read an article here which was indicating that you can use a DataReader in order to get data from sqldatasource, but it doesn't say how, the only thing that is said is to use DataSourceMode property in order to adjust it for a DataReader.
Parent - User UserID UserName Status 1 Shallin [code]...
I also have parent & child object class.I would like to use 1 C# function and 1 SP to handle the retrieve portion but I have 1 problem.I'm not sure how to assign the value from Reader to the object.I do something like this but I only get 1 country which is the last country.
if (dr.HasRows)
{ while (dr.Read()) [code]....
how to handle this Parent/ child object with only 1 function and 1 SP?
why this first connection works but the second doesn't?
[Code]....
I'm trying to use <asp:FileUpload> to upload images and as far as I know you have to use <asp:SqlDataSource> to do it but I need to create the connections string using entries stored in a database.
When a sql query returns NULL , I can use the following code to evaluate:
[Code]....
When a sql query returns nothing, neither IsDBNull nor is Nothing works. I don't know why some sql queries return null while some return nothing when there are no data returned. But anyway, can somebody tell me how to evaluate nothing value returned in sql datareader in vb.net? When I put the cursor over signInfo variable in debug mode, I can see Nothing show as its value. But the line does not work
