|
In a C# 2010 web form application, I need to make a change where some logic is hard-coded and I want to obtain the values from a sql server 2008 r2 database.
Before I make any changes, I want to make certain I understand how the existing logic work.
In a microsoft training class for C#.net, I learned about delegatesand worked on 'labs' to teach you the concepts.
When you look at the code I listed below:
LabelCustomerName.Text += transaction.CustomerName;
LabelCustome_Status.Text += transaction.Customer_Status;
you can see the customer name and customer_status are placed into
textboxes.
I am guessing that the fields to the right of the += are delegates.
If this is true, can you tell me how to find the original location where the values are obtained from?
If these are not delegates, can you tell me and/or point me to a reference that will help me determine where the orginal values are obtained from?
Should I use system.reflections? If so, can you tell me what code to use so I would know how to use system.reflections?
|
|
|
|
|
In this particular case, the fields on the right are not delegates (i.e. in C terms, a function pointer).
This is an assignment operator. This does a simple concatenation on the LabelCustomerName.Text value.
You can read more about this operator here[^].
A delegate is added to an event / eventhandler combination.
For e.g. if you had used the Label's Keydown event, you could have added a delegate that allowed a certain method to execute everytime keydown fired.
E.g. LabelCustomerName.KeyDown += MyMethod(object sender, KeyEventArgs e);
|
|
|
|
|
What is the way to develope report in asp.net
|
|
|
|
|
There's several different ways. You can use Crystal Reports or any reporting tools out there. A google search will bring up quite a few for you.
You may want to look into Microsoft Reporting Services[^]
""Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
|
|
|
|
|
|
Dear All,
Which third party grid is best for asp.net. I'm looking for grid for transaction purpose where can add multiple rows from client side.
Thanks
Basit.
|
|
|
|
|
The last one I used for that purpose was from: Infragistics[^]. Worked pretty well. I think the're all very similar: one may have a few features the other don't and so on. You need to look at as many as you can and decide which is the best fit for your purpose.
"If you think it's expensive to hire a professional to do the job, wait until you hire an amateur." Red Adair.
nils illegitimus carborundum
me, me, me
|
|
|
|
|
basitsar wrote: Which third party grid is best for asp.net
That would depend on your need, usage & comfort-ability with a given third party. I would say it would be individual's choice from below list:
1. DevExpress
2. Infragistic
3. Telerik
Have a look at all three, evaluate by yourself. All have good controls, knowledge-base and support forums.
|
|
|
|
|
I'm a big fan of DeveloperExpress.
http://www.devexpress.com/[^]
Their Grid control is amazing along with their other tools.
BTW: I've actually met some of the engineers at a meet & greet in NYC about a year ago ... very cool to talk with them.
My 2 cents.
|
|
|
|
|
I think Telerik is the best!
its rad grid have a wonderful Facilities filtering for every column with to many filter, and grouping by drag and drop , handling too many scenario , and perfect examples and documents!
|
|
|
|
|
"Best" is of course different depending on what you need. InterSoft[^] has a great grid and has a batch update feature which allows you to add as much as you like client side, or delete of course, and then process in a batch.
There are only 10 types of people in the world, those who understand binary and those who don't.
|
|
|
|
|
Also check Obout grid.
thatrajaNobody remains a virgin, Life screws everyone 
|
|
|
|
|
Try DevExpress or Infragistics.
|
|
|
|
|
Quote: hi,
I am using an aspxgridview and two checkboxes(for header and dataitem).When I check header checkbox I want to check all checkbox.I am also using java script code.essentially, I can do this, but I must check header checkbox twice times.I didnt understand why it is happening.ı am writing this code checkbox_checked event and header checkbox's autopostpak is true. When I used normal gridview I didnt have any problem I could do this without problem.,
<script language="javascript" type="text/javascript">
function SelectAll(id) {
var IsChecked = id.checked;
var Chk = id;
// Parent = document.getElementById('GrdPerliste');
Parent = document.getElementById('<% = GrdPerliste.ClientID%>');
var items = Parent.getElementsByTagName('input');
for (i = 0; i < items.length; i++) {
var deneme = items[i].type;
if (items[i].id != Chk && items[i].type == "checkbox") {
if (items[i].checked != IsChecked)
{ items[i].click(); }
}
}
}
</script>
protected void Checksec_CheckedChanged2(object sender, EventArgs e)
{
CheckBox chk = (CheckBox)sender;
GridViewHeaderTemplateContainer bulundugucontainer = (GridViewHeaderTemplateContainer)chk.NamingContainer;
((CheckBox)bulundugucontainer.FindControl("Checksec")).Attributes.Add("onclick", "javascript:SelectAll('" + ((CheckBox)bulundugucontainer.FindControl("Checksec")).ClientID + "')");
}
|
|
|
|
|
First, your issue/flow of why two clicks
This happens as you add the onclick attribute in checkchanged event. So, for a fresh page, first click postbacks and you register javaScript code for checkbox. Second click uses this registered JS method and you get what you want.
You can do it without any postback or server event - just using a Javascript. You need to attach the JS code to checkbox in Grid's RowDataBound event where very rowbind is called. Once this is done, single click would work.
Have a look at these:
Using JavaScript with ASP.Net GridView Control[^]
Using jQuery without RowDataBound code[^]
|
|
|
|
|
How to get control values in itemupdating event of detailsview.
I have tried e.Newvalues["field_name"] but that doesn't work .
|
|
|
|
|
|
hello friends place can anyone help me...
I need to get the data from BAPI and display that data in the ASP.NET Crystal Report....
|
|
|
|
|
I had to Google BAPI to figure out what your referring to. Upon searching for the context of BAPI, I came across many forums that answer how to connect to the SAP database using asp.net.
You should try the SAP website or forum for using asp.net to connect to SAP. As far as the crystal reports goes, I thought that was a windows report module.
|
|
|
|
|
|
I have a C#.net 2010 web form application that I need to add two tables to the database. This application uses linq to sql. Can you tell me if I want to add these two new tables to the sql server 2008 r2 database, do I
1. Need to remove the original .dbml file and recreate the .dbml file?
2. I would think I can just add two tables to the database and somehow refresh the existing .dbml file. If this possible?
Whatever your answer is to the question, can you tell me how to solve this problem?
|
|
|
|
|
classy_dog,
double click on the dbml file and on the view menu choose server explorer add a link to the server your database is modeled from (you may already have one), you can click in any white space in the dbml diagram and look at the properties->connection->connection string to get the connection string. Once you have the server connection you can just drag the table(s) into the diagram.
|
|
|
|
|
I am trying to edit values in a row of a GridView, Gender DropDownList which is filled with values "Male" and "Female" is giving following error :
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.
Source Error:
Line 65: DropDownList cmbType = (DropDownList)GridView1.Rows[e.RowIndex].FindControl("cmbType");
Line 66:
Line 67: customer.Update(Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Values[0].ToString()), txtName.Text, cmbGender.SelectedValue, txtCity.Text, cmbType.SelectedValue);
Line 68: GridView1.EditIndex = -1;
Line 69: FillCustomerInGrid();
Source File: d:\ASP.NET Examples\LoginExp\CustomerData.aspx.cs Line: 67
Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.]
CustomerData.GridView1_RowUpdating(Object sender, GridViewUpdateEventArgs e) in d:\ASP.NET Examples\LoginExp\CustomerData.aspx.cs:67
System.Web.UI.WebControls.GridView.OnRowUpdating(GridViewUpdateEventArgs e) +131
System.Web.UI.WebControls.GridView.HandleUpdate(GridViewRow row, Int32 rowIndex, Boolean causesValidation) +908
System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup) +809
System.Web.UI.WebControls.GridView.OnBubbleEvent(Object source, EventArgs e) +163
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +56
System.Web.UI.WebControls.GridViewRow.OnBubbleEvent(Object source, EventArgs e) +119
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +56
System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) +106
System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +175
System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +31
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +32
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +242
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3825
Please help me solve this error.Thanks in advance.
|
|
|
|
|
As explained here http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.datakeys.aspx[^]
When the DataKeyNames property is set, the GridView control automatically creates a DataKey object for each row in the control. The DataKey object contains the values of the field or fields specified in the DataKeyNames property. The DataKey objects are then added to the control's DataKeys collection. Use the DataKeys property to retrieve the DataKey object for a specific data row in the GridView control.
The reason for null reference exception in the above code could be due to not setting the DataKeyNames property but accessing the DataKeys[e.RowIndex] value at
customer.Update(Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Values[0].ToString())
Try setting the DataKeyNames as shown in above reference like
datakeynames="CustomerID"
|
|
|
|
|
you can't use .ToString() method and set it to a null value,
GridView1.DataKeys[e.RowIndex].Values[0] is passing a null value!
set DataKeys for your gridview!
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
