Clean Way To Output Values In MVC Views When Value Is Not Null?
May 21, 2010
Is there a better way to write the code below? I have quite a few blocks that are similar, and this is making the code in the Viewpage very messy to work with. The data value with the associated label only needs to be output when certain conditions are met, which is almost always if the value is not null. The options I can think is to use a response.write to atleast minimize the usage of the ASP script tags, or to format the webpage is such a way that the label displays with an appropriate n/a type value.
<% if (myData.Balance != null)
{ %>
Balance: <%= String.Format("{0:C}", (myData.Balance))%>
<% } %>
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Nov 20, 2010
My model include this attribute
public class RegisterModel
{
//blah blah Attribute[code]....
before run into the view , i check the field , see it contain value . But after running through this view
[Code]....
The output field is null , while other attribute still ok , why is it ?how can i resolve this ?
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Jan 4, 2010
How do you evalute a null sql output paramater. I've tied several ways but can find one that works. I always get an error code of Conversion from type 'DBNull' to type 'String' is not valid.
I've tried both IsDbNull and if the value = nothing - both return the same error.
Code:
If IsDBNull(e.Command.Parameters("@JobCount")) Then
Me.lblInternalJobCount.Text = 0
Else
Me.lblInternalJobCount.Text = e.Command.Parameters("@JobCount").Value
End If
'I have also tried checking for nothing and that doesn't work either
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Jan 26, 2011
How can i check if an output parameter is null before i bind it to a asp literal, and if it is null i want to just make the literal
hname1.Text = cmd.Parameters("@hotel1").Value
hname1.DataBind()
hname2.Text = cmd.Parameters("@hotel2").Value
[code]...
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Apr 23, 2013
I have article.aspx page that there is some Textboxs and fileupload control and insert when users click on btnInsert their data insert into database below is Behind code
protected void btnInsert_Click1(object sender, ImageClickEventArgs e)
{
string path = Server.MapPath(".") + "../image/House/article/pdf";
string filename = System.IO.Path.GetFileName(fuppdf.PostedFile.FileName);
string[] validext = { ".pdf" };
string ext = System.IO.Path.GetExtension(fuppdf.PostedFile.FileName);
if (Array.IndexOf(validext, ext.ToLower()) < 0)
[code]....
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Oct 20, 2010
SOURCE CODE -
Code:
<asp:GridView runat="server" ID="Grd" AutoGenerateColumns ="false" >
<Columns >[code]....
You can see in Pic Attached, Records of table TBL_STUDENT, and also find the output what I am getting . For the records - 2 and 3 whose Name is B and C, I m getting the correct status,But for the Record whose Name is A, I am not getting correct Output, Because in Database null is dere, I want if in database null is dere then checkbox is Unchecked. How to to dat???
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Apr 3, 2013
i am using a gridview in my web page,i used to bind the database records to the gridview..my columns are name,empid,company name,pl leave,sl leave,total leave taken here total leave taken is not a database fields,in the page i want to fill the records once loaded pl leave and sl leave is added and display in the total leave taken column..it working properly when all pl ans sl columns fill with numbers,if some pl and sl leave having blank values.it showing an error like input sting was not in correct format..this is my code
<Columns>
<asp:BoundField DataField="slno" HeaderText="SerialNo"
SortExpression="slno" />
<asp:BoundField DataField="ecode" HeaderText="Employee Code"
SortExpression="empcode" />
<asp:BoundField DataField="ename" HeaderText="Employee Name"
[code]....
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Oct 26, 2010
From this below stored Procudure, using VB.Net code can i get the Values like "Number of Rows Affected" and "Yes / No" Value from "Select"Stored Procudure:ALTER PROCEDURE [dbo].[lookup] @week_date datetimeAS
DECLARE @currweek datetime, @inweek datetime
IF @week_date = '10/14/2010'
BEGIN
UPDATE dbo.work_status SET ob_flag = 0, ob_update_date = NULL WHERE dbo.work_tatus.week_date ='10/14/2010'
SELECT 'YES'
END
ELSE
SELECT 'NO'
RETURN 0
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Nov 7, 2010
I need to loop through an XML document (no problem over there) and check if a value that i find is already in a (a) tag in a div in my XSL document that i am generating, only if the value is not in that (a) tag i should create a new (a) tag for it and put in in the div that i am checking... how to do it dynamically in XSLT?
<div id="tags"><span class="l_cap"> </span>
<a href="#" class="current">all</a>
<xsl:for-each select="root/nodes/node/data/genres">[code]....
what i am trying to do is: in the if statement, check if the current value is already exist in the div if not, add it, if is, don't do anything...
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Aug 11, 2010
I probally just tired but I would have swore I had seen an example of this some where for MVC 2,
I want to call a partial view that shows the products information with a GUID passed to the partial view.
I guess you would call it calling a sub but have that sub in a view that i can strongly wire up.
What i need is tutorials for passing a value to the partial view.
Like if i had pictures and i wanted to call a ascx that would show the picture. and have many to a page.
An example about pictures wired into a entities database would rock.....
I did try to look around on here to find some but my mind just gave out on me today....
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Feb 15, 2011
I am getting always output parameter values null albeit in stored procedure I assigned output param values to 2.both of (MYTOTAL,MYPER) should return 2 but always null.
some code to attempt retrieving multiple output values
[Code]....
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Apr 12, 2010
I have a typical gridview/formview master control setup. When I try to update or insert I don't get any errors but it also doesn't work. When I try to insert data all I get are null values and when I update, none of the values are updated. The formview looks like its working, but just doesn't. The primary key is an identity and it auto-increments by one.
[Code]....
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Aug 9, 2010
Here is my stored proc
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
Create PROCEDURE [dbo].[sp_GetNextSeq] (
@p_NextSeqNo int = NULL OUTPUT
)
AS
BEGIN
SET NOCOUNT ON;
BEGIN TRY
BEGIN TRANSACTION
Generate Next Sequence Number
[code]...
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Feb 7, 2010
I am trying to create a simple page with a drop down list which has 3 items. Choosing any of those 3 items calls for a specific constructor in the script. Using VB 2008
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if (DropDownList1.Text == "Coupe")
{
//Response.Write("You chose the Coupe");
string Engine;
string Transmission;
string Wheels;
string Safety_Features;
string Key_Systems;
string Interior;
string Mileage;
Altima A1 = new Altima(Engine, Transmission, Wheels, Safety_Features, Key_Systems, Interior, Mileage);
Response.Write(A1.displayAuto());
}
if (DropDownList1.Text == "Hybrid")
{
Response.Write("You chose the Hybrid");
}
if (DropDownList1.Text == "Sedan")
{
Response.Write("You chose the Sedan");
}
}
public class Altima
{
//private member variables
private string Engine;
private string Transmission;
private string Wheels;
private string Key_System;
private string Safety_Features;
private string Interior;
private string Mileage;
//public accessor methods
public void displayAuto()
{
System.Console.WriteLine(Engine, Transmission, Wheels, Safety_Features,Key_System, Interior, Mileage);
}
//constructors
public Altima(string Engine, string Transmission, string Wheels, string Safety_Features, string Key_System, string Interior, string Mileage)
{
this.Engine = Engine;
this.Transmission = Transmission;
this.Wheels = Wheels;
this.Key_System = Key_System;
this.Safety_Features = Safety_Features;
this.Interior = Interior;
this.Mileage = Mileage;
string Engine = ("2.5-litre DOHC engine with 175 HP and 180 lb-ft of torque or 3.5-litre DOHC engine with 270 HP and 258 lb-ft of torque");
string Transmission = ("-speed manual transmission or available Xtronic CVT® with manual mode");
string Wheels = ("17 inch 5-spoke aluminum-alloy wheels (2.5 S) or 18 inch 5-split spoke aluminum-alloy wheels (3.5 SR)");
string Safety_Features = ("Six standard air bags as part of Nissan Advanced Airbag System (AABS)");
string Key_System = ("Nissan Intelligent Key® with Push Button Ignition");
string Interior = ("Leather");
string Mileage = ("Up to 5.6 L/100 km on city with eCVT");
}//coupe -------> First constructor
public Altima(string Engine, string Transmission, string Safety_Features, string Mileage)
{
this.Engine = Engine;
this.Transmission = Transmission;
this.Safety_Features = Safety_Features;
this.Mileage = Mileage;
string Engine = ("2.5-litre DOHC engine with 175 HP and 180 lb-ft of torque or 3.5-litre DOHC engine with 270 HP and 258 lb-ft of torque");
string Transmission = ("-speed manual transmission or available Xtronic CVT® with manual mode");
string Safety_Features = ("Six standard air bags as part of Nissan Advanced Airbag System (AABS)");
string Mileage = ("Up to 5.6 L/100 km on city with eCVT");
}//sedan -----------> Second Constructor
public Altima(string Engine, string Transmission, string Mileage)
{
this.Engine = Engine;
this.Transmission = Transmission;
this.Mileage = Mileage;
string Engine = ("2.5-litre DOHC engine with 175 HP and 180 lb-ft of torque or 3.5-litre DOHC engine with 270 HP and 258 lb-ft of torque");
string Transmission = ("-speed manual transmission or available Xtronic CVT® with manual mode");
string Mileage = ("Up to 5.6 L/100 km on city with eCVT");
}//hybrid -----------> Third constructor
}
}
how do I ouput the values from the constructors when I choose the specific list box item?
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Sep 28, 2010
I am learning MultiView control.Here are question:I added 5 views in the MultiView but all views are tight together. I can not drag and drop another control such as text boxes or labels into view area.
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Jan 28, 2010
protected void rptNavigation_ItemDataBound(object sender, System.Web.UI.WebControls.RepeaterItemEventArgs e){
if (!((e.Item.ItemType == ListItemType.AlternatingItem) || (e.Item.ItemType == ListItemType.Item)))
{return;
}string Name = string.Empty;
if (IsDBNull(e.Item.DataItem["FullName"])) {
Name = String.Empty;}
else {Name = (string)(e.Item.DataItem["FullName"]);}
Literal ltlLiteral = (Literal)(e.Item.FindControl("ltlLiteral"));
ltlLiteral.Text = Name.ToString();
I get error for IsDbNull - Error 1 The name 'IsDBNull' does not exist in the current context. What's the best way to check for null values returned from db? also I get errors on both lines where (e.Item.FindControl(ltlLiteral")); is present ERror: Cannot apply indexing with [] to an expression of type 'object'
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Aug 2, 2010
Using Combobox in my webpage, in a combobox i want to display a null values first, then it should display all values..
Combobox.item = null values
combobox.item = 1
Combobox.item = 2
cmd = new OdbcCommand("Select vehicleno as vehicleno from tb_car", con);
ada = new OdbcDataAdapter(cmd);
ada.Fill(data1);
cmbvnoview.DataValueField = "vehicleno";
cmbvnoview.DataSource = data1;
cmbvnoview.DataBind();
Above code is working, but is displaying all the values, first it should display a null value, then it should display all the values.
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Apr 13, 2010
I want to know how to handle null values....
for eg i hav a datetime field called Completion date which temporarily has a null value and when i display the records using a gridview it displays a default date...how do i get rid of this default date.the completion Date gets entered at a later stage in the application following which the gridview should show this date....but initially it shouldn't show anything
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Sep 30, 2010
info.Text += " Filiale " + oUser.Filiale.Filialnummer;
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Mar 10, 2011
I have a data table say i have a column like x which is primary key so i should get the row where this x values in empty.
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Mar 2, 2010
what is the best way to get the number of null values in an array in C#?
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Aug 19, 2010
I am writing an ASP.Net web application. I have listview, it's datasource is a LinqDataSource. In my database, I have a staff table and I am trying filter for records by their team using a dropdownlist. This works fine, until I select "All" in the dropdownlist. It returns all staff except for the ones where the teamID is null. How can I return the records where teamID is null?
This is my code:
<asp:ListView ID="ListView1" runat="server" DataSourceID="ldsStaff" DataKeyNames="staffID">
<LayoutTemplate>
<table>
<tr>
<th>Name</th>
<th>Team</th>
</tr>
<tr>
<td> </td>
<td><asp:DropDownList ID="ddlTeamFilter" runat="server" DataSourceID="ldsTeams" DataTextField="Team" DataValueField="TeamID" AppendDataBoundItems="true" AutoPostBack="true">
[Code]....
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Feb 16, 2011
I have the following code
public class ProductDetails
{
private string _productid;
public string ProductID
{
get { return _productid; }
}
private string _description;
public string Description
{
get { return _description; }
}
private string _image;
public string Image
{
get { return _image; }
}
public ProductDetails(string productid, string description, string image)
{
_productid = productid;
_description = description;
_image = image;
}
}
public class DataAccess
{
private static string connectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
public ProductDetails GetProductDetails()
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("ProductDetails", con);
cmd.CommandType = CommandType.StoredProcedure;
string productid = HttpContext.Current.Request.QueryString["productid"];
cmd.Parameters.Add(new SqlParameter("productid", SqlDbType.NVarChar)).Value = productid;
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
reader.Read();
ProductDetails pro = new ProductDetails(
(string)reader["ProductID"], (string)reader["Description"], (string)reader["Image"]);
reader.Close();
return pro;
}
}
protected void PopulateControls()
private DataAccess da = new DataAccess();
{
ProductDetails product = da.GetProductDetails();
if (product.Description == String.Empty)
{
lblDescription.Visible = false;
}
else
{
lblDescription.Text = product.Description;
}
}
In the last piece i want to check if the Description field is null or empty in order to hide the label control but i get an error if i write: if (product.Description == DBNull.Value) and can only use ring.Empty. But i want to check for NULL values as well..
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Apr 18, 2010
First off, suggest better ways if you want rather than patch up this code. I am just starting this project and it is first time I have tried to code a web site so anything you suggest is very much welcomed. I have spent the last 2 and 1/2 days trying to find workable answers to this but none I have found and tried seem to fit. If needed I can email screens shots or code. I am trying to construct a website that will have the same main theme throughout as far as the header, navbars sitemap, and footer go. Naturally the content will vary from page to page. I want to use a single master page and css stylesheet for this main theme and I will change the content format as needed per page because each page may vary somewhat.
However, about 15 of the pages will all use the same format for their content and this format will differ from the rest of the site but the format of the main theme will stay the same. So I am trying to create a nested master page to use to format the just the content area for all these pages while retaining the main theme for the header, etc.. I believe I should use a separate css file with the nested master page to handle the formatting of the content areas for these 15 pages. I have code that looks like it works when viewed in web developer but design view but does not work when viewd through a browser (IE, Chrome, Firefox). So far I have the following done in web developer.
If it helps the code and screen shots follow. Master Page called "Parent.master". For all theme throughout site Nested Master Page called "Lab.master". For the 15 like pages Primary stylesheet file for main theme called "StylesheetNew.css" For site theme Secondary stylesheet file to syle the 15 like formatted pages. It is called Labmaster.css Labs.apsx file to use as first of the 15 like pages.
Finally screens shots from web developer and browser. Sorry try as I might I could not capture screenshots and put them into this post. The problem is that web developer shows all the area (many lines high) with gray background and with the XXX text that I want to allocate for content in the 15 pages. Yet all the browser show is one line of text o a white background followed by the footer. It looks like the LabStyleSheet works in Web Developer but not in a browser.
Parent.master
<%@ Master Language="VB" CodeFile="Parent.master.vb" Inherits="MasterPage" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "[URL]">
<html xmlns="[URL]">
<head id="ParentHeader" runat="server">
<title>HX5</title>
<asp:ContentPlaceHolder runat="server" id="headerPlaceHolder" />
<link href="~/StyleSheetNew.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div id="wrapper" >
<div id="Header" >
<table class="hdrtbl1" >
<tr>
<td id="hdrtd1" style="width:175px; height:100px;" >
<img id="logo" alt="Logo" src="../Images/logo.png" style="width: 136px; height: 87px" />
</td>
</tr>
</table >
<table class="hdrtbl2" >
<tr><td id="hdrtbl2td1"><b> Providing Professional Technical, Manangement and Business Solution</b></td></tr>
<tr><td id="hdrtbl2td2"> <b> Services since 2004 </b></td></tr>
<tr> <td id="hdrtbl2td3" align="center" ><img id="rdln" alt="RedLine" style=" height:3px;" src="../Images/RedLine.png" /></td></tr>
<tr><td id="hdrtbl2td4" > <b>Committed to Excellence In All We Do</b></td></tr>
</table>
</div>
<div id="navbardiv">
<ul id="topnav">
<li><a href="../pages/about.aspx" >About Us <img style=" border: none; " src="../Images/arrow-down.gif" /></a>
<!--Subnav Starts Here-->
<span>
<a style="font-weight:lighter; " href="#" >Who We Are </a> |
<a href="#">Locations</a> |
<a href="#">Business Classifications</a> |
<a href="#">Contact Us</a> |
</span>
</li>
<!--Subnav Ends Here-->
<li><a href="../pages/services.aspx">Services <img alt="arrow" style="border: none; " src="../Images/arrow-down.gif" /></a>
<!--Subnav Starts Here-->
<span>
<a style="font-weight:lighter; " href="#" >Capabilities</a> |
</span>
<!--Subnav Ends Here-->
</li>
<li><a href="#">Customers <img style=" border: none; " src="../Images/arrow-down.gif" /></a>
<span>
<a style="font-weight:lighter; " href="#" >Subnav Link</a> |
<a href="#">Customer Locations</a> |
<a href="../pages/labs.aspx">Labs</a> |
</span>
</li>
<li><a href="#">Careers <img style=" border: none; " src="../Images/arrow-down.gif" /></a>
<!--Subnav Starts Here-->
<span>
<a style="font-weight:lighter; " href="#" >Joining the HX5 Team</a> |
<a href="#">Current Opportunities</a> |
</span>
</li>
</ul>
</div>
<div id="subnavbar" >
<!-- <asp:SiteMapPath ID="SiteMapPath" runat="server">
</asp:SiteMapPath> -->
</div>
<div id="topContent" style="border-bottom:solid 1px #191970;">
<table>
<tr><td style="height:30px; width:900px;" >
<asp:ContentPlaceHolder id="TopPlaceHolder" runat="server">
</asp:ContentPlaceHolder>
</td>
</tr>
</table>
</div>
<!-- <div id="mainContent"> -->
<asp:ContentPlaceHolder id="MainPlaceHolder" runat="server" />
<!-- </div> -->
<!-- <div id="lowerContent"> -->
<asp:ContentPlaceHolder id="LowerPlaceHolder" runat="server">
</asp:ContentPlaceHolder>
<!-- </div> -->
<div id="footerContent" style=" height:50px; width:900px; text-align: right; background-color: #ccc; ">
<span style=" font-family: Arial, Helvetica, sans-serif; font-size: xx-small; font-weight: bold; color: #000080; margin: 30px 20px 0px 0px;"> Copyright 2010 HX5, LLC All rights reserved</span></div>
</div>
</form>
</body>
</html>
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Nov 3, 2010
my table field allows null values. but my code below does not work unless a value is assigned to my variable even though the glable variable is initialised to 0; tried the DBNull.Value - still, it gives me error as the table in question is linked and expecting a value.
[Code]....
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