DataSource Controls :: ParameterDirection.ReturnValue Vs ExecuteScalar()?
Apr 26, 2010
Since both retruns the value. Then whats is the difference between ParameterDirection.ReturnValue and ExecuteScalar()
int i = Convert.ToInt32(cmd.ExecuteScalar())
objCmd.Parameters.Add("@ColumnnTest", SqlDbType.Decimal).Value = objPropertiesClassName.Columnnumeric;
objCmd.Parameters["@Columnnumeric"].Direction = ParameterDirection.ReturnValue;
objCmd.ExecuteNonQuery();
int i = (int)objCmd.Parameters["@Columnnumeric"].Value;
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Jul 13, 2010
How and where can I get the returnvalue from my "DeleteGuestById" method to show the right error message to my user?
I have this:
Protected Sub gvGuestlist_OnRowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs) Handles gvGuestlist.RowCommand
If e.CommandName = "DeleteGuest" Then
Dim index As Integer = Convert.ToInt32(e.CommandArgument)
Dim data As DataKey = gvGuestlist.DataKeys(index)
Dim GuestId As Integer = data.Values("id")
odsGuestlist.DeleteParameters.Clear()
odsGuestlist.DeleteParameters.Add("id", GuestId)
odsGuestlist.Delete()
End If
End Sub
In my BLL:
<System.ComponentModel.DataObjectMethodAttribute(System.ComponentModel.DataObjectMethodType.Update, False)> Public Function DeleteGuestById(ByVal ID As Integer) As Integer
Dim returnval As Integer
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Return returnval
End Function
I think I have to be in the ObjectDatasources' "OnDeleted" method but I have no what code to place there.
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Jul 27, 2010
I have a simple procedure which updates a table. The procedure works fine and I have tested it in Management Studio. However when I am calling that procedure from code, nothing is happening. cmd.ExecuteScalar returns null when it should return the ID.Has anyone faced anything similar? Any pointers as to how this can be resolved?
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Mar 29, 2010
I have just finished converted a vb.net app to c# and one of the lines is to get @ReturnValue from the parameter.I ended up having to CAST a lot of things..Is there not a easier wayhere is what i have
int rc = ((System.Data.SqlTypes.SqlInt32)(((System.Data.SqlClient.SqlParameter)(cmd.Parameters["@ReturnValue"])).SqlValue)).Value;
In vb.net it was as simple as doing this
Dim rc As Integer = Convert.ToInt32(cmd.Parameters("@ReturnValue").Value)
Alot easier :-)But the problem with C# is the property Value isn't available unless I Cast to SqlParameter and i also need to cast to Sqltypes.SqlInt32 - i can't just do a standard Convert.ToInt32
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Nov 28, 2010
Im setting up an OData provider in visual studio. The error that im receiving really doesnt have anything to do with OData side of things.I have a table type in my ado entity data model and whenever I try to insert a record into this table i get the following error: {"The member with identity 'ReturnValue' does not exist in the metadata collection.Parameter name: identity"}
at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache)
at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
[code]...
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Dec 6, 2010
I have this SQL Select statement to select the basket id where the user id equals a specific ID.I want to store the result of the query in a variable, so I thought I could have done:
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Jan 8, 2010
I have the SqlCommand Problem. cmd is the sqlcommand and when run cmd.Executescalar(), what will it return??
As I have the problem below code that it always prompt invalid cast which may be in the assigning BAtchno.
What do you think?? How to Correct below code??
--------------------------------------------------------
sSQL = "select max(batchno) from QI_WMS.dbo.WMS_StockRelease_Shipment with(nolock) "
+ " where convert(varchar, SRDate, 111) = @DateReceive and
WarehouseID=@WarehouseID";
[code]...
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Aug 30, 2010
I need to carry the newly created value to another page using the ExecuteScalar method, I'm using the try catch finally but I'm a bit stuck with it,
[Code]....
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Oct 21, 2010
I know for a fact that the SQL statement below returns NULL but my code statement "if (obj != null)" is not working.When I debug it I see a value of {} ... not sure what that is. Here is my code:
[Code]....
So, even if SQL returns NULL, it still validates obj as NOT NULL !
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Dec 5, 2010
I posted a question about how to save the result of an SQL command to a variable and was told that the execute scalar method should be used, however I can't use it, I'm using the System.Data.SQLClient reference but still not finding it
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Jan 4, 2010
I am using following oracle query and using executescalar() to fetch data
sql = "select username from usermst where userid=2"
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Oct 6, 2012
I use below code for my button event
int Result = _cmd.ExecuteNonQuery();
if (Result > 0)
{
Session["Login"] = true;
Response.Redirect("~/Managers.aspx?BehCode=" + Server.UrlEncode(TextBox1.Text));
}
But it didn't work it didn't go to managers.aspx page but when I replace code with below code it worked correctly it go to managers.aspx
int count = Convert.ToInt32(_cmd.ExecuteScalar());
if (count > 0)
{
Session["Login"] = true;
Response.Redirect("Managers.aspx?BehCode=" + Server.UrlEncode(Txtbeh.Text));
}
Why this happen whats exact different between two code?
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May 7, 2015
ExecuteScalar requires an open and available Connection. The connection's current state is closed.
namespace ITS_Group{ public partial class Login : System.Web.UI.Page {
private DataTable GetData(SqlCommand cmd) {
DataTable dt = new DataTable();
String strConnString = System.Configuration.ConfigurationManager.ConnectionStrings[1].ConnectionString;
SqlConnection con = new SqlConnection(strConnString);
[CODE]..
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Oct 22, 2010
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Sep 13, 2010
I'm using Visual Studio 2008, and my database is SQL Server 2000.
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Mar 10, 2011
i have problem white Object datasource. i have a multi-tier Application that include common layer ,DAL Layer,business logic and persantation layerwhen i add a object datasource to my page, it bring me only common layer classes . but i want use bisuiness layer classes what do i do ?
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May 20, 2010
I have several web forms which use a GridView linked to a DataSource control which is defined at design time as follows:
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id="dsStates"
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connectionstring="<%$ ConnectionStrings:PgSqlConnection %>"
oldvaluesparameterformatstring="Original_{0}"
providername="<%$ ConnectionStrings:PgSqlConnection.ProviderName %>" >
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Nov 15, 2010
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[Code]....
However, how do I now access the OrganisationID property of an "Organisation" type session variable (called "Organisation")? I have tried this, which does not seem to work: <asp:SessionParameter Name="OrganisationID" SessionField="Organisation.OrganisationID" Type="Int32" />
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Feb 25, 2010
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At present the two datasource controls declared , render data to the page simultaneously during pageload. I want to first check data in textbox's from first source, before second datasource is rendered to screen. note, both are filtered by a page variable. i wish to leave the textbox datasource control in situ, as other controls and code depend on it.The other detailsview datasource is my problem?
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to use a datasource from within another datasource..?
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Mar 2, 2010
ASP.net SQL datasource C# code behind
I want the webpage to show a message that there is no data selected,
Instead of showing blank details view
here is a picture of blank details view:
[URL=http://img28.imageshack.us/i/errorks.jpg/][IMG]http://img28.imageshack.us/img28/4328/errorks.jpg[/IMG][/URL]
What C# code do i need to use so that, whenever I enter that page, only an error message will show up
instead of the details view ..etc.
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Dec 1, 2010
im explaining this base on a test page that i have hosted as i was trying to track down my problem, i have a hosted page which i have hosted on the internet on a hosting service provider. the page has a normal gridview that is linked to a SqlDataSource. and theSqlDataSource has sql statements for selecting data, updating and deleting. They all work fine locally and even if i host them locally through IIS. but on the hosting service they down work. only the select work, which means i can view my data on the gridview but i cant manipulate it, delete and updating dont wanna work, they dont do anything. and the worse part is that im not even getting an error from them, on the grid i have enabled the autogenerate edit button and the delete, how can i make the update and delete work, or what is it that makes them not to work. the code for my test page is below
[Code]....
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Feb 23, 2011
I've a listview with checkbox control in it and datasource as object data source.
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