my table column is:
AttachContent varbinary (max)
when i try to retrieve the data and i get this below error, i am using linq
cannot convert from 'System.Data.Linq.Binary' to 'System.IO.BinaryReader'
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I am trying to get the following code behind to store a file in a datbase using Linq (with *dbml). I am getting an intellisense error in my "For each" loop the says the following":Value of 'Byte' cannot be converted to 'System.Data.Linq.Binary'I have been searching for awhile, but I can't seem to find a solution that has worked for me yet.
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i will be passing the xml file like this:
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error:
Error 1 The best overloaded method match for 'System.Xml.Linq.XDocument.Load(string)' has some invalid arguments
cannot convert from 'System.IO.Stream' to 'string'
If I have below code, how to make it work as it has below compile error:
Error: cannot implicitly convert type 'System.Linq.Iqueryable<system.data.DataSet> to 'System.Data.Dateset'. An explicit conversion exists.
public DataSet GetProductList()
{
using (var sdatabase = new DatabaseDataContext())
{
IQueryable<DataSet> result = wmsdatabase.ExecuteQuery<DataSet>(@"SELECT productid, productname from product group by productid, productname").AsQueryable();
return result; // Compile error here
}
}
I have this method which does not build, it errors with the message:
Cannot implicitly convert type 'System.Web.HttpPostedFile' to 'System.Web.HttpPostedFileBase'
I really need this to be of type HttpPostedFileBase instead of HttpPostedFile, I have tried boxing and it does not work:
foreach (string inputTagName in HttpContext.Current.Request.Files)
{
HttpPostedFileBase filebase =HttpContext.Current.Request.Files[inputTagName];
if (filebase.ContentLength > 0)
{
if (filebase.ContentType.Contains("image/"))
{
SaveNonAutoExtractedThumbnails(doc, filebase);
}
}
}
i work with visual studio 2005 and asp net 2.0. i have a method method as this :
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this problem is follow if i run the web method and don't enter a string and a int a receive this message : System.ArgumentException: Cannot convert to System.Int32. ok when i arrive in the method i can check if lists is empty but how i can do if int is NULL because i don't want to returns a error if people run my web method and don't enter the parameters.
I use to store image in bytes and able to convert it to system.drawing.image but not sure how to render it on page
View 2 RepliesIs it possible to convert a datatable into binary data and save it into on a binary field on database?
View 2 RepliesI've just used Visual Studio to create a linq to sql class. In the .designer.cs file the code includes:using System.Data.Linq;However, when I compile the projeget:Compiler Error Message: CS0234: The type or namespace name 'Linq' does not exist in the namespace 'System.Data' (are you missing an assembly reference?)The code is completely generated by Visual Studio
View 5 RepliesThe error i am getting for the below code is:Cannot implicitly convert System.Web.UI.WebControls.GridViewRow to System.Web.UI.WebControls.GridView
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
GridView row = GridView1.SelectedRow;
strv1 = row.Cells[1].Text;
}
I downloaded the OracleHelper.cs & I use VisualStudio 2008,I'm suppose to pass values to a stored procedure which accepts 2 parametersWhen i pass from codebehind it says,
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I have been trying to get the data display on the datagrid after selecting a customer.
With the same connection it populates the selection right. But just do not seem to extract the following SQL.
The litABC is to check the flow of control.
There is no syntax error but in the debug menu,
I got A first chance exception of type 'System.Data.Odbc.OdbcException' occurred in System.
Where did I do wrong?
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When i fill my sql adapter daAuthors.Fill(dsPubs, "MYTable") sometime i get A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dllmy code can run for a lot hours without any problems but sometime i get the message
View 1 RepliesI wasted the better part of the day on this and am no closer to a understanding the issue than what I was this morning.
I am looping through a set of objects and marking them for deletion. The 2nd one always causes the above exception. tb_invoice has a FK to tb_shipment.
As always, I am probably missing something very obvious, but I have stripped out so much from this code already that there is nothing left, and I am still getting this exception. This is a local SQL 2008 instance and there is of course nothing and nobody changing the invoice in between reading them and calling SubmitChanges().
myDataContext db = new myDataContext();
IQueryable<invoiceDetail> pendingInvoices
db.GetInvoiceDetailPending();
foreach (invoiceDetail id in pendingInvoices) {
tb_shipment s = db.GetShipmentById((Guid)id.shipment_id);
db.tb_invoices.DeleteOnSubmit(
db.GetInvoiceById(s.tb_invoices.FirstOrDefault().id)); }
SubmitChanges(); // fails for the 2nd invoice
}
I am using System.Linq.Dynamic to create the following query at runtime:
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I can then successfully display vMediaQ in a GridView.But I need to be able to access the individual fields (column headers and data) in vMediaQ, which is of type System.Linq.IQueryable.
I have a System.Data.Linq.DataContext object and need to know the proper way of closing it out before it goes out of scope in order to prevent the following error when making a bunch of database changes:
Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.
Can I just call obj.Dispose() or do I need to call obj.Connection.Dispose() or obj.Connection.Close()?
I guess what I want to know is will calling obj.Dispose() end up executing the functionality in obj.Connection.Dispose() and obj.Connection.Close(). The MSDN documentation that I found on these functions does not have this information (at least I didn't see it - I could have mistakenly overlooked it).
I have downloaded Visual Web Developer 2010 Express and am trying to use LINQ. In order to do that I have added a LINQ to SQL class to the web site and have dragged tables from the database view into the LINQ designer, which worked fine.But..When I add: using System.Data.Linq;to MainPage.xaml.cs, I receive an error:
Error 3 The type or namespace name 'Data' does not exist in the namespace 'System' (are you missing an assembly reference?)Even although I have references to System.Core, System.Data, System.Data.Linq in the website references.
I need a linq-to-sql use dbml, then I follow this article : http://www.west-wind.com/weblog/posts/147218.aspxSet the child to internal, set serialzable to unidirection and add updatecheck=never
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_DvdId",
AutoSync=AutoSync.OnInsert, DbType="Int NOT NULL IDENTITY", IsPrimaryKey=true,
IsDbGenerated=true, UpdateCheck=UpdateCheck.Never)]
[global::System.Runtime.Serialization.DataMemberAttribute(Order=1)]
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Is there a way to do the following in VB:dim sTableClass as string = <my underlying table class in linq>dim dbTab as system.data.linq.table(<typed class of sTableClass>)I've tried cycling through the table objects of the linq data context and retrieved the following: Dim ddData = pkDB.GetTable(tt.RowType.Type.UnderlyingSystemType)(where tt reflects the row of the table I want to retrieve) But the expression returns and itable and I need the table equivalent but can't get this to work with a stri
View 1 RepliesI have a GridView with geography data in th cells. When iterating through the rows and creating a list and array, I have
GpsPoint[] GpsArray = new
GpsPoint[counter];
List<string> LineLista =
new List<string>();
foreach (GridViewRow row
in GridView1.Rows)
{
int i = 0;
GpsArray[i].Geolat = row.Cells[3];
GpsArray[i].Geolong = row.Cells[4];
LineLista.Add(row.Cells[2].Text);
i++;
}
and I got this:
Compiler Error Message: CS0029: Cannot implicitly convert type 'System.Web.UI.WebControls.TableCell' to 'float'
Source Error:
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I created DBML file inside DLL. compiled it and added a reference to it into a website project.When try from webproject to use the DLL I get error.
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I am getting error "Cannot implicitly convert type 'string' to 'System.Data.DbType".
When I am passing Stored procedure parameter it expets 'System.Data.DbType" and the Data member is declared as a string.
I wanted to delete the record from data but I receive this error "Unable to cast object of type 'System.Data.Linq.DataQuery`1[training_eval.Course]' to type 'training_eval.Course'.
Dim eval_sure = From ev In db.Evaluates Where ev.course_id = indexcourse Select ev.course_id
Dim del_course = From c In db.Courses Where c.Course_id = indexcourse
db.Courses.DeleteOnSubmit(del_course)
db.SubmitChanges()
I have a strange problem. I am adding a LinqDatasource object, and set the context:
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Then I get this error:The type 'System.Data.Linq.DataContext' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
On web.config I already have this:
<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
NOTE: The datacontext is in a different project (DLL proect) where I added a refernce to System.Data.Linq.
is there another way adding a refernce to a web project? or only though teh web.config?