C# - Binding Nullable Bit Database Column To CheckBox In GridView - Crash When Null

Nov 24, 2010

I'm trying to bind a nullable bit column, which at the moment is mostly null, but I need to somehow convert the null to a 'false' on runtime because it doesn't bind to a checkbox if it's null. But, I am currently unable to change the default value and update all records accordingly - is there a way to do this in runtime?

View 2 Replies

Similar Messages:

VS 2008 Checkbox Column In Gridview/unable To Get Correct Output, Because Database Null?

Oct 20, 2010


<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???

View 3 Replies

Update Nullable Column In Db To Null?

Sep 13, 2010

Can anyone reliably get the EDS to save a nullable column to the databse as a "null" when bound to any of the controls such as "FormView"?I have tried using several different UpdateParameters (Session, ControlParamater, Parameter, etc). I have tried setting "ConvertEmptyStringToNull" to true and leaving the property off entirely. Nothing works. On my "Inserts" it works fine.(I have made sure the column is set to nullable = true in the Entity Designer.....)

View 7 Replies

Implications Of Changing Column From Not Null To Nullable In Entity Framework?

Apr 1, 2011

I have to change the username column in my database to nullable, which means everywhere in my code, I now have to check username.HasValue and change references to username to username.Value. Is there anything I can do to avoid having to change all the references to username to username.Value?

View 1 Replies

C# - How To Edit Column Value Before Binding To Gridview After Retrieving From Database

Nov 16, 2010

After i retrieved a set of datatable from database, i need to edit the rows value before binding to the gridview. for example, a set of datatable is retrived from database.

eg: [userid], [userEmail] --> 1 , james@hotmail.com

i would like to change "james@hotmail.com" to "james" then bind it to gridview. Every rows of [userEmail] will be separated with the mail extension (@hotmail.com) ... how should i do..?

View 2 Replies

Forms Data Controls :: Link Checkbox With Bit Column, So Bit Column In SQL Database Gets Updated?

Mar 6, 2011

I'm currently working on a small project and therefore created a gridview, including one bit column which has been linked with a checkbox in both the itemtemplate as the edititemtemplate (autopostback = true).Databinding for these two checkboxes has been linked (two-way) to the bit column.Now I want to display the gridview to end-users. They should be able to just click on the checkbox so they value in the database column gets changed as well (as I want to run update queries behind it), but not passing via the command column 'EDIT'.=> problem I'm having now is that the bit column in the database doesn't get updated.

View 3 Replies

GridView With Checkbox Column. Client-side Script To Uncheck All Except Current Checkbox?

Jun 29, 2010

I am dynamically binding a typed list to a GridView control.

The Grid View Control is in an asp.net page that is wrapped in an asp:UpdatePanel (Ajax).

The first column contains a checkbox control.

Only one checkbox may be checked in this column.

If the user checks a checkbox, all other checkbox must be unchecked.

I am trying to achieve this using client-side script without success.

In the handler for the GridView's RowDatabound event, have attempted to add an attribute to the CheckBox contained within the cell.


View 2 Replies

Binding A Nullable Int To An Asp:TextBox?

Mar 25, 2010

I have a property int? MyProperty as a member in my datasource (ObjectDataSource). Can I bind this to a TextBox, like

<asp:TextBox ID="MyTextBox" runat="server" Text='<%# Bind("MyProperty") %>' />

Basically I want to get a null value displayed as blank "" in the TextBox, and a number as a number. If the TextBox is blank MyProperty shall be set to null. If the TextBox has a number in it, MyProperty should be set to this number.If I try it I get an exception: "Blank is not a valid Int32".

But how can I do that? How to work with nullable properties and Bind?

View 2 Replies

C# - How To Get A Null Value From Database To A Checkbox In FormView

Aug 2, 2010

i want parse null value and disable checkbox in form view how can i do that that's my current code:

<asp:CheckBox ID="FLPCheckBox" runat="server" Text="Full Load Passed" Checked=' <%# (Eval("FullLoadPassed")==DBNull.Value ? false : Eval("FullLoadPassed"))%>' />

View 1 Replies

Web Forms :: How To Validate A Gridview Column Based On Another Checkbox Column

Apr 6, 2010

I have a gridview which displays following columns:

TaskID, TaskDescription, IsComplete, DateOfCompletion

Now what I want to achieve is, when user clicks IsComplete checkbox, she must enter the date of completion. So, I want a validation (client side) on DateOfCompletion if the checkbox is selected (checked). And, I also want to use Validator Callout Extender
if possible.

How can I achieve this?

View 2 Replies

C# Null Syntax - How To Set A Field To Be Nullable

Feb 6, 2011

I remember being told that you can add some syntax to the end of a statement that will do something if the field is null. Pretty vague, but I cant seem to find anything about it via google.

I definitely isnt how to set a field to be nullable. I know that.

Here is an example of what I want.

int? field1 = 0;

field1 = int.parse(string2); (where string2 is a passed value, that could be null)

I thought there was something you could put at ?? if it is a null, such as:

field1 = int.parse(string2) ??;

Or do I have to check every if every string2 is null before making that statement.

View 16 Replies

Bind Nullable Bool To Checkbox In MVC 2

Feb 16, 2011

How to bind nullable bool to checkbox in MVC 2. I try with this code in view:

<%: Html.CheckBoxFor(model => model.Communication.Before)%>

But show me compilation error.

View 2 Replies

MVC :: System.Nullable Doesn't Accept (int?) Null?

Jul 21, 2010

My designer.cs file of all the SQL tables is generated by LINQ-TO-SQL. The class and attribute in question is like this.

Transfer :INotifyPropertyChanging,[code]...

I need to assign a null to the attribute so that the value 0 does not get save to the database.

View 2 Replies

C# - Unable To Set A Nullable Int To Null In A Ternary If Statement?

May 4, 2010

The C# code below:

int? i;
i = (true ? null : 0);

gives me the error:

Type of conditional expression cannot be determined because there is no implicit conversion between '<null>' and 'int' Shouldn't this be valid?

View 3 Replies

MVC :: Nullable DateTime Give Invalid Modelstate If Null?

Mar 19, 2011

Got a nullable datetime member on my viewmodel.the moment it hit my controller action, the viewmodel's modelstate allready are invalid (because the member is null).Forgot...how that works? (using MVC2)Basically my viewmodel have a social security number, passport number and passport expiracy date.If the ssn is entered, I want to ignore the two passport related fields, so I made the expiracy date member nullable.

Like all other viewmodels in this app, each model have it's own validation function that will do validation, and in there I add an error that the date is required or not valid (if using passport number). mvc itself should not care about the date at all.I dont want to give the date a default value, because then the date will show when the form loads, and it must be an empty field (unless I already got a date of course.

View 4 Replies

Forms Data Controls :: Updating The Datasource / Mark All The Values In The Binding Column Of Datasource If Checkbox In Headertemplate Is Checked?

Sep 29, 2010

I am creating a custom gridview control which has a custom CheckBoxTemplateField column (deriving from TemplateField class). This template field column has custom Checkboxheadertemplate (implementing ITemplate) and CheckboxItemTemplate (also implementing ITemplate). In InstantiateIn method of both templates (header as well as Item template), I am adding a checkbox control which has Autopostback = true.

My requirement is:
I want to mark all the values in the binding column of datasource if checkbox in headertemplate is checked. I dont want to mark only rows visible on grid. I WANT TO MARK ALL ROWS IN DATASOURCE. I want to do this in _CheckedChanged event of checkbox in header template.

Problem I am facing: When I check/uncheck the checkbox in header, it postbacks. so in OnCheckedChanged event, gridview's datasource is null. Secondly, in any event of gridview, I could access only those rows of datasource for which corresponding rows are visible in gridview through Gridviewrow.DataItem property. But I want to set it for all rows in datasource.

View 5 Replies

How To Pass Null To A Nullable Parameter Of A .NET Web Service Method Via Javascript

Aug 24, 2010

public class Quotes : System.Web.Services.WebService
public void Calculate(int param1, int? param2)

View 2 Replies

MVC :: The Null Value Cannot Be Assigned To A Member With Type System.Int32 Which Is A Non-nullable Value?

Dec 26, 2010

When i click on the page that represents a controller the following error was displayed:-

"The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type"

On this link of code

var articleapproval = articletyperepository.FindAllArticlesRequireMyApproval().ToList();
while the FindAllArticlesRequireMyApproval execute the following LINQ statement :-
var articleapproval= articletyperepository.FindAllArticlesRequireMyApproval().ToList();

where this methods calls the following LINQ statement:-

View 2 Replies

Forms Data Controls :: Displaying A Null Or Empty Cell For A Null Datetime Database Value In Gridview?

Dec 6, 2010

I have setup my business object to have a create_date and edit_date members both datetime datatypes. My company want to display the create_date and edit_date fields in a gridview for each transaction. The problem i have is that after insterting a record it will have a valid create_date but no edit_date and when displayed in the gridview it defaults to datetime.minvalue (My default). How on earth do i show an empty field in my gridview for a null datetime field in the database?

I am using similar architecture to the Imar Spaanjaars example of a tiered solution. With a few small tweeks it has worked well for me for ages. I am passing a List<Database> to my object datasource which connects to my gridview.

View 3 Replies

ADO.NET :: The Null Value Cannot Be Assigned To A Member With Type System.Int32 Which Is A Non-nullable Valu...

Nov 17, 2010

My code:


If the value is null writes out that error.How to check if the value is null? And if the value is null, I want to store + 1

View 1 Replies

C# - NLog - Write NULL To Optional Database Column

Jan 28, 2011

I am using NLog for logging in an ASP.Net application and making use of the database target with Microsoft Sql Server.I have some logging parameters that are optional and not always specified. I would like these to be written as null when they are not provided, however NLog seems to always write them as empty strings.

Is there a way to configure it to write null as the default?

Ref: http://nlog-project.org/wiki/Database_target

View 2 Replies

MVC :: Binding Each Gridview Column With A Property?

Mar 16, 2011

Is their any way I can bind each column of the grid seperatly with each property? It is possible to do that in web form, but i am not sure about MVC grids.

View 2 Replies

Web Forms :: Insert NULL Value For Date Column In Database If TextBox Is Blank

Jun 16, 2015

How should i insert null values into a database. I have textbox1 and the textbox2 will convert the value out of textbox1, when i the time i click save and the textbox1 is empty i got an error, "Conversion from string "" to type 'Date' is not valid." i just want to insert null value if the textbox is empty.

View 1 Replies

Insert Multiple Checkbox List Values Into Database In Single Column Using C#?

Aug 4, 2010

i use this to select one checkbox to isselected column how i convert this to multi checkboxlist to single column i use many ways more than 3 days without success

private void BindCheckBoxList()
DataTable dt = new DataTable();
SqlConnection connection = new SqlConnection(GetConnectionString());
string sqlStatement = "SELECT * FROM boby";
SqlCommand sqlCmd = new SqlCommand(sqlStatement, connection);
SqlDataAdapter sqlDa = new SqlDataAdapter(sqlCmd);
if (dt.Rows.Count > 0)
CheckBoxList1.RepeatColumns = 4; // set the number of columns in the CheckBoxList
CheckBoxList1.DataSource = dt;
CheckBoxList1.DataTextField = "Name"; // the items to be displayed in the list items
CheckBoxList1.DataValueField = "Name"; // the id of the items displayed
//Setting the Selected Items in the ChecBoxList based from the value in the database
//to do this, lets iterate to each items in the list
for (int i = 0; i < dt.Rows.Count; i++)
if (!string.IsNullOrEmpty(dt.Rows[i]["IsSelected"].ToString()))
CheckBoxList1.Items[i].Selected = Convert.ToBoolean(dt.Rows[i]["IsSelected"]);
catch (System.Data.SqlClient.SqlException ex)
string msg = "Fetch Error:";
msg += ex.Message;
throw new Exception(msg);
private void Update(string name, bool isSelected)
SqlConnection connection = new SqlConnection(GetConnectionString());
SqlCommand cmd;
string sqlStatement = string.Empty;
sqlStatement = "UPDATE handymen SET IsSelected = @IsSelected WHERE Name = @BizName";
cmd = new SqlCommand(sqlStatement, connection);
cmd.Parameters.AddWithValue("@Name", name);
cmd.Parameters.AddWithValue("@IsSelected", isSelected);
cmd.CommandType = CommandType.Text;
catch (System.Data.SqlClient.SqlException ex)
string msg = "Insert/Update error";
msg += ex.Message;
throw new Exception(msg);
protected void Page_Load(object sender, EventArgs e)
if (!Page.IsPostBack)
protected void Button1_Click(object sender, EventArgs e)
string str = string.Empty;
for (int i = 0; i < CheckBoxList1.Items.Count; i++)
if (CheckBoxList1.Items[i].Selected)
str = CheckBoxList1.Items[i].Text;
Update(str, CheckBoxList1.Items[i].Selected);
//ReBind the List to retain the selected items on postbacks

View 3 Replies

SQL Server :: Dynamic Nullable Columns Depending On The Value Of A Column?

Feb 11, 2011

I have a master document which is composed of other document types (some are required and some are not). While the master document's status is "Draft" I need to ignore all not nullable constraints (because the writer may decide to work on one of the children
documents that is not required and save as draft).

The closest solution I found for this problem is check constraints but I have not yet to see an example of this in check contraint and I'm not even sure if this is possible. Has anyone implemented a similar solution with check constraints (or any other methods)?

View 2 Replies

Copyrights 2005-15 www.BigResource.com, All rights reserved