DataSource Controls :: If Value In Sqldatasource Is Null Run Code?
May 15, 2010
what i would like to do is when the value of my sqldatasource is returned, then if it is null, run a code, in my case, redirect them to the login page, heres my code:
string connectionString = ConfigurationManager.ConnectionStrings["PokemonPlanetConnectionStrings"].ConnectionString;
string insertSql = "SELECT * FROM LoggedInUsers WHERE UserId = @UserId";
using (SqlConnection myConnection = new SqlConnection(connectionString))
[Code]....
Now what i would simply like to do is, if the select statement searches the database, and the result is not found, the simply redirect them to "register.aspx"
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Similar Messages:
May 24, 2010
In following SQL query: SELECT DISTINCT CodeID, CodeDesc FROM Faults.TblFltClearCodes AS TblFltClearCodes
I am getting a list but there is no null value.Within this query I would like to get only one NULL value at the top and then the list.How to do this? Explicitly I am not allowed to give a null value in the table in DB.
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Sep 23, 2010
I have a FormView which is bound to an SQLDataSource. When a user clicks on a save button the form, I need to write any changes made to the FormView back to the table.
I have a Stored Procedure on my MSSQL 2005 database that should be executed when the user clicks on the save button.
It appears the Update is firing, but when I trap the DbCommand object in the SQLDataSource's 'Updating' event, all of the parameters that should be passed to the Stored Procedure are coming through as NULLs. Consequently, the Stored Procedure isn't updating anything.
In the click event of the save button I'm explicitly firing the SQLDataSource's Update method:
[Code]....
The parameters in the SQLDataSource <UpdateParameters></UpdateParameters> section appear to be correct.
Can anyone give me an idea on what to investigate to figure out why it appears the Update is only picking up NULLs?
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Dec 21, 2010
this is my html code [Code]....
i need to set null value to SqlDataSource Insert Parameter at runtime
i am used this code
[Code]....
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Jan 24, 2011
I am not able to figure out why I am getting the null error at SqlDataSource10.Insert(); I tried running through break points and i checked the Insert statement and it has all the required values .. but I get error saying it cannot insert null into NrNarrativeDays. I am working off a sample at this link..
http://www.aspdotnetfaq.com/Faq/How-to-insert-row-in-GridView-with-SqlDataSource.aspx
[Code]....
Datasource and Gridview code is below
[Code]....
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Feb 21, 2011
I have a SqlDataSource connected to database and use a parametrized query to fetch out data.Query has got a very large varchar field on which i have to perform a search.To make search, i have 2 combobox and a textbox organized in this way
MAIN CATEGORY (combobox)-> CATEGORY TYPE(combobox) -> MODEL(textbox).
Based on main category choose, category type is filled from database. At last, it's added a "nothing" combobox item.Now i should search into big varchar field adding category type condition but, if nothing is specified, i should make identical search like all combobox value are selected. How should i, in your opinion, make this using SqlDataSource?
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Apr 16, 2010
Can the select command of a SqlDataSource be given by code in the code behind file. Also by calling the SqlDataSource.Select can the select statement be executed?
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Sep 12, 2010
Using a FormView with a SqlDataSource, I'm attempting to Update data
by calling a stored proc in code behind. I was having trouble getting parameters
using Update Parameters in the SqlDataSource, but found a working solution by
coding the parameters.
The problem now is I'm getting an "Updating is not supported by data source 'XYZ' unless UpdateCommand is specified'.
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Aug 1, 2010
Is Sqldatasource powerful? Is there any disadvantage using it over other controls?
And How to use Sqldatasource from code behind with datacontrols like gridview,detailsview and formview?
Is it possible to completely customize the gridview using sqldatasource from code behind?
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May 14, 2010
I am trying to tie a sqlDatasource to a Stored Procedure. The stored procedure looks like...
[Code]........
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Aug 28, 2010
What ive been using now is getting datas in code-behind, passing datasource into a Session, re-binds it to a gridview whenever there's paging/sorting needed. What i want to know is what is better if its performance we are talking about?
Is it datasource into a session Or SqlDataSource for which I know whenever paging/sorting needed is that sqldatasource opens up a DB connection to get the datas again?
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Jan 16, 2010
I downloaded a sample Rolodex from here: [URL] the file to download is at the bottom of the page and it is called 'RolodexDatalist.zip (6.71 kb)' So I changed the HTML to it points to my SQL Server DB. I changed the ConnectionString to this:
<connectionStrings>
<add name="CustomersConnectionString" connectionString="Data Source=EXCEL-4J2W8KYNPSQLEXPRESS;Initial Catalog=Customers;Integrated Security=True"
providerName="System.Data.SqlClient" />
</connectionStrings>
Now, everything points to my DB! I thought, ok great, this should be pretty easy. However, when I debug, I get this error message: 'Null reference was unhandled by user code. Object reference not set to instance of an object. Troubleshooting Tips: use the "new" keyword to set an instance of an object.' This line is yellow:
Dim conStr As String = ConfigurationManager _
.ConnectionStrings("conStr").ConnectionString
Here is the code-behind:
Imports System.Data
Imports System.Data.SqlClient
Imports System.Collections.Generic
Partial Class VB
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
If Not IsPostBack Then
ViewState("CurrentAlphabet") = "ALL"
Me.GenerateAlphabets()
Me.BindDataList()
End If
End Sub
Private Sub BindDataList()
Dim conStr As String = ConfigurationManager _
.ConnectionStrings("conStr").ConnectionString
Dim con As New SqlConnection(conStr)
Dim cmd As New SqlCommand("spx_GetContacts")
cmd.Connection = con
cmd.CommandType = CommandType.StoredProcedure
cmd.Parameters.AddWithValue("@Alphabet", ViewState("CurrentAlphabet"))
con.Open()
dlContacts.DataSource = cmd.ExecuteReader()
dlContacts.DataBind()
con.Close()
If ViewState("CurrentAlphabet").ToString().Equals("ALL") Then
lblView.Text = "all Contacts."
Else
lblView.Text = "Contacts whose name starts with " & _
ViewState("CurrentAlphabet").ToString()
End If
End Sub
Private Sub GenerateAlphabets()
Dim alphabets As New List(Of Alphabet)()
Dim alphabet As New Alphabet()
alphabet.Value = "ALL"
alphabet.isNotSelected = Not alphabet.Value _
.Equals(ViewState("CurrentAlphabet"))
alphabets.Add(alphabet)
For i As Integer = 65 To 90
alphabet = New Alphabet()
alphabet.Value = [Char].ConvertFromUtf32(i)
alphabet.isNotSelected = Not alphabet.Value _
.Equals(ViewState("CurrentAlphabet"))
alphabets.Add(alphabet)
Next
rptAlphabets.DataSource = alphabets
rptAlphabets.DataBind()
End Sub
Protected Sub Alphabet_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim lnkAlphabet As LinkButton = DirectCast(sender, LinkButton)
ViewState("CurrentAlphabet") = lnkAlphabet.Text
Me.GenerateAlphabets()
Me.BindDataList()
End Sub
End Class
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Feb 25, 2010
i have two sqldatasource controls. one i use to display data in textbox's ,filter'd by a select parameter in page behind code. Once checked, i want to copy this data to the other datasource ,by selecting checkbox.Then display this data in detailsview control.
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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May 7, 2015
On update the dropdown value shows NULL in database : here's structure for my gridview
<asp:TemplateField HeaderText="Construction Phase" SortExpression="Phase_Name">
<EditItemTemplate>
<asp:DropDownList ID="EditedDropDownInGrid" runat="server" CssClass="form-control" DataSourceID="PhaseSQLDataSource" DataTextField="pp_name" DataValueField="pp_id">
</asp:DropDownList>
</EditItemTemplate>
[Code] ....
It updates other controls in gridview but does not update my selected dropdowns item value in Integer format which is inside gridview...
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Sep 4, 2010
I have asked similiar question before where I have two control on the page header says "username" and "gender". User can select both the control or either one and the page will execute searching based on the criteria supplied. So if username supplied
SELECT * FROM [this_table] WHERE username = @username
and if gender supplied
SELECT * FROM [this_table] WHERE gender = @gender
and if both supplied
SELECT * FROM [this_table] WHERE username = @username AND gender = @gender
I know this sounds not very complicated but in my case, I am having like more than 10 controls up there. It is something likeusername, gender, age, date of brith, title, father name, frst name, last name, blur blur blur and it's a lot then I started to lost. if i were to use if else caluse on code-behind and produce query, it would end up writing a lot of if-else and if i use stored procedure (with if-else) then my stored procedure would contains a lot of if-else statement. I am fairly new to this concept and if I'm on the wrong track, please correct me. Is there any better way to save my hair without actually going through each
if-else statement to build the query ?p.s. I'm using GridView and SqlDataSource command to display the result back on .aspx page.
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Oct 4, 2010
I am trying to check whether a username exists in my database before inserting the new row & display a message to the user if it does.
On my SqlDataSource my InsertCommand looks like this:
InsertCommand="IF NOT EXISTS (SELECT * FROM Users WHERE UserName = @UserName) BEGIN INSERT [Users] ([UserName], [FirstName], [LastName], [City], [State], [Country], [CompanyName], [Active], [PasswordHash]) VALUES (@UserName, @FirstName, @LastName, @City,
@State, @Country, @CompanyName, @Active, @PasswordHash) END"
This works as expected: If the username is unique, the row is created.
If the username already exists, the row is not added.
The problem is, if the row already exists, the insert is rejected but the user is not notified.
So my question is, is there a way I can notify the user?
Maybe something like: InsertCommand = "If Not Exists (select....) Begin Insert...Else Notify User Somehow End This is a basic database, I'm not using the built-in membership provider nor will be.
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Jan 21, 2011
How do I programmatically add ParameterCollection ?
[Code]....
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Jul 31, 2010
i use below sqldatasource for search within a gridview and it is working fine.i just add this control and set gridview datasource id to sql datasource id .but i need the same in codebehind dynamically.i need like this becuase i need to search in three textbox but before i use one textbox. so could someone show me a example how i add a sqldatasourse in code behind and set filter parameter for search from a gridview.
[Code]....
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Jun 23, 2010
Which one is better for me to store urls of my products images while i was trying to bind images with gridview. provide me some code snippet to bind images to gridview with XMLDataSource.
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Jan 27, 2010
If I have a SqlDataSource like this one, is it possible to add a DataRelation in the sqldatasource? Or do I need to create a DataSet and add the Relation in CodeBehind?
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:CString %>"
SelectCommand="SELECT * FROM table">
</asp:SqlDataSource>
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Jan 29, 2010
Basically, what I want to do is to get all my data in 1 statement and then pull data from that into a GridView. I already have the columns that I want displaying in the GridView, but now I want to insert a footer row in between the header row and all the datarows, that contains a couple columns that will be the same for every row in the GridView. So something along the lines of this:
Header1 Header2 Header3
Dept: Technology
data1 data2 data3
data4 data5 data6
data7 data8 data9
The thing is, I don't know what that "Dept" will be, so I want to pull it from my SqlDataSource that already has it.
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Sep 4, 2010
I have a gridview with a sqldatasource with SelectCommand as below:
[Code]....
but it's not workling.....
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Oct 11, 2010
i have an SQLdatasource in my page
i was trying to modify it as:
SQL.SelectCommand = "Select * from " + TXT_Tabella.Text;
because i want update dinamically my sql server tables but ,every time i am going to sort, or change page the selectCommand returns as before!
viewState is true! how can i have an SQLdatasource dinamyc by tableName? and how this problem occurs?
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Feb 26, 2010
What is the best way to put a Greater than sign in an SqlDataSource
The code will run but it is underlined with an error "Attribute values must be enclosed in quotation marks."
Sample code looks like this...
SelectCommand="Link.Section, Link.PostDate.....
WHERE...
and (PostDate <= GetDate()) and (isnull(postremove, getdate()) >= getdate()))">
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May 25, 2010
I need to get one record from rows. For example:
DB:
id, name, age, nick, gender , etc...
1, John, 18, gobb, M, ....
2, Andrew, 22 , AND, M, .....
3, Simon, 35, Lucky, M, ......
How to Get name (For example Simon) from DB and enter it into label? Or perhaps this is impossible?
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