Web Forms :: How To Convert QueryString Value To Integer
Jun 22, 2012
protected void Page_Load(object sender, EventArgs e)
{
string imageUrl = Request.QueryString["img"];
int imageHeight = Request.QueryString["h"];
int imageWidth = Request.QueryString["w"];
[code]...
when i run it this error occur...An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS0029: Cannot implicitly convert type 'string' to 'int'Source Error:
Line 21: string imageUrl = Request.QueryString["img"];
Line 22:
Line 23: int imageHeight = Request.QueryString["h"]; Line 24: int imageWidth = Request.QueryString["w"];
Line 25:
i think i should convert strin to int but i dont know how i can do it.
i need to convert from string to integer, i tried in all ways but no luck.... here is my code
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here in checkdDoorID integer value is available, but i can't convert to string. i tried ctype,parse but nothing worked out. i need the value in integer so that i can stored in DB as primary key.
I need to convert a timespan into an integer. I have two dates that I am subtracting one from the other, returning a value in days. I then need to perform some arithmatical functions on that value but I cant figure out how.
I want to convert Label text into Integer datatype. I tried by giving Convert.Int32(Label1.Text) and int.Parse(Label1.Text) but I couldn't do Type casting . I am getting error at runtime. I searched in web I couldn't get the solution.
Possible Duplicate: Convert.ToInt32() a string with Commas i have a value in the label as: 12,000 and i wish to convert it into an integer like 12000 (use it for comparison) i tried int k = convert.toint32("12,000"); this does not work.
STDNo nvarchar(6) //student number primary CID nvarchar(7) //course ID primary DNo int //Department Number primary H1 int allow null // Home work 1 H2 int allow null H3 int allow null H4 int allow null H5 int allow null Q1 int allow null //Quize 1 Q2 int allow null Q3 int allow null Q4 int allow null Q5 int allow null HE1 int allow null HE2 int allow null FExam int allow null // Final Exam
and stored procedure like this:
ALTER procedure [dbo].[AddMonthlyMarks] ( @STDNo nvarchar(6), @CID nvarchar(7), @Dno int =isnull, @H1 int, @H2 int,..........................
the Data key name of grid is STDNo the problem is that the instructor this month will add only homework1(h1) for specific student number or to all students and rest of home works and quezies will not entered (Null), to the next month he will enter home work 2 ,etc... i get an error and i think that the null values for others home works in grid make this error caution: in table i check allow null property,the data type is integer How i can convert this null values to integer?
My querystring is a long URL to a repository node...is there a way to encrypt it such that it's not humand readable and I can just convert it back in my code behind?
Here in below code i have used querystring for sending imagename from this page to another page. Now i just want that with this imagename in also want to send span element's text with same querystring.How can i achieve this?
The following code works well as long as I pass a querystring value to the datalist.
Private Sub BindGrid() Dim id As Integer = Integer.Parse(Context.Request.QueryString("id")) Dim strConnString As String = ConfigurationManager.ConnectionStrings("Conn").ConnectionString Using con As New SqlConnection(strConnString) Using cmd As New SqlCommand() cmd.CommandText = "select Id, Name from tblFiles where Id=@Id"
[Code] ......
However, the page errors with the message "Value cannot be null." if I don't pass a value. I know that DataList does not have an EmptyItem Property like a Gridview control. I do not want the page to error if I don't pass a value. Need info to deal with empty values in a datalist.
Most websites have pointed me to this code to use:
The 'list' throws an error. The error is "Too few type arguments to 'System.COllections.Generic.List". I am not sure if the code is written in C# and that is what is causing the error. It seems that it should work but I can not figure out the 'list' error.
In the standard forms authentication, users are identified by a Guid. I want to give my users an UserId of type int (doesn't have to be the primary key, just something to do lookup's on).
Is it safe to add an additional column to the aspnet_users table, or should I create a new table which FKs to the UserId column and has a Unique column which generates the integer ID?
The later sounds like a bad performance hit to take just for the sake of an int!
EDIT I want to create URLs like those on stackoverflow. eg.[URL] where the User ID is an int. For that reason I don't want to use Guids.
A very easy one hopefully - what expression can I use to validate an integer to ensure it is greater or equal to zero, but less than 2,147,483,647 (i.e. the maximum value of an integer)?
I'm trying to use a variable returned from the database as an integer. My thought is to use a Link button and when my user clicks it, it should open a new window. However, its giving me an error stating the value is in the wrong format. Here is my link button code.
System.FormatException was unhandled by user code Message=Input string was not in a correct format. Source=mscorlib StackTrace: at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at System.Convert.ToInt32(String value) at Training_profiles_profile.Page_Load(Object sender, EventArgs e) in d:projectsDIETMIWEB_svn-trunkDIETMIWEB_svnTrainingprofilesprofile.aspx.cs:line 25 at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) InnerException:
This has never happened before. It is not happening even in my visual studio. It is only happening on the live site. This never happened before on the live site either. I changed the master template but the change I made had nothing to do with the issue here. 3
[Code]....
Exception Details: System.InvalidCastException: Conversion from type 'DBNull' to type 'Integer' is not valid.Source Error:
I have an sproc which selects data out of my table. The column can return integer or NULLs.
I get the 'failed to enable constraints error' when databinding. If I go to my tableadapter and select my column there is a NullValue property which has 'Throw Exception, Null, Empty'. If I try and unset the exception option it tells me only strings are allowed this. However the 'AllowDBNull' option is set to TRUE.
What is the alternative and will this be fixed in 2010?
