Efficient Design - Passing Parameters Back And Fourth?
Apr 21, 2010
I am developing an application that will have 200+ sessions at any given time. I am also relatively new at asp.net development. This application will be hosted on a remote server along with its SQL Server 2008 database. Each session will constantly use SQL select, update, insert, and delete commands. Do you think it would matter if I used server-side logic to perform all the SQL commands, passing parameters back and fourth? Or should I do some more research on client-side database manipulation? Would it be too much load if i used strictly server-side?
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Mar 11, 2011
I have a page with a partialview on it which is a list of items. I have a button on it which shows the next 5 items.
This is done via ajax:-
[code]...
My question is that I need the 'page' variable to increment each time someone presses the form button which is contained within the partialview.
How do I keep track of that variable?
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Jan 16, 2011
Im new to database design and I would like to know what is the best way to design a tagging system such as the one that stackoverflow has?
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Jul 9, 2010
In this answer to my question of how to insert data into SQL Server he mentioned passing parameters instead of string concatenation like I currently have.
Is this really necessary for security? If so, what exactly is passing parameters? When i google it I get a lot about stored procedures. Is that what I want, I do not know about stored procedures....yet.
EDIT:
Ok, here is what I got. It seems to update the database correctly and eventually I will change the hard coded ints to inputs from a label. confirm if how I did this is not vulnerable to any sql injection or hacks.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Security;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
public partial class Stats : System.Web.UI.Page
{
public SqlDataReader DataReader;
public SqlCommand Command;
string queryString = ("INSERT INTO UserData (UserProfileID, ConfidenceLevel, LoveLevel, HappinessLevel) VALUES (@UID, @CL, @LL, @HL);");
//string queryString = ("INSERT INTO UserData (UserProfileID, ConfidenceLevel, LoveLevel, HappinessLevel) VALUES ('a051fc1b-4f51-485b-a07d-0f378528974e', 2, 2, 2);");
protected void Page_Load(object sender, EventArgs e)
{
LabelUserID.Text = Membership.GetUser().ProviderUserKey.ToString();
}
protected void Button1_Click(object sender, EventArgs e)
{
//connect to database
MySqlConnection database = new MySqlConnection();
database.CreateConn();
//create command object
Command = new SqlCommand(queryString, database.Connection);
//add parameters. used to prevent sql injection
Command.Parameters.Add("@UID", SqlDbType.UniqueIdentifier);
Command.Parameters["@UID"].Value = Membership.GetUser().ProviderUserKey;
Command.Parameters.Add("@CL", SqlDbType.Int);
Command.Parameters["@CL"].Value = 9;
Command.Parameters.Add("@LL", SqlDbType.Int);
Command.Parameters["@LL"].Value = 9;
Command.Parameters.Add("@HL", SqlDbType.Int);
Command.Parameters["@HL"].Value = 9;
Command.ExecuteNonQuery();
}
}
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Apr 21, 2010
when i worked in .NET 1.1 i used to pass parameters to user control using the method- (if the name of the usercontrol is "tables")
dim r As tables =
CType(Page.LoadControl("~/usercontrol/tables.ascx"), tables)
and calling public property of the usercontrols.
the problem is that i can't the way to do it in 2008 ver of .NET, it is not recognize the usercontrol.... how can i pass parameters to the usercontrol in run time?
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Oct 9, 2010
[Code]....
and my Index
[Code]....
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Aug 3, 2010
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public List<Inquiry> GetInquiries(string fromDate, string toDate,
string subject, string press,
string cia, string media,
[code]...
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Dec 27, 2010
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<asp:DropDownList ID="lstMyList" runat="server" OnSelectedIndexChanged="lstMyList_SelectedIndexChanged"></asp:DropDownList>
protected void lstMyList_SelectedIndexChanged(object sender, EventArgs e)
{
...
}
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Aug 24, 2010
I am trying to use a parameter field where there is a subreport in my main report but i keep getting the error "subreport cannot be shown" when running the report.
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May 23, 2010
I have a page with a lot of pictures on it. I want the user to be able to click on the picture and either bring up a popup type of window passing it the Param name and value , or to have the picture be replaced with this object.
<object id="ADR2" type="application/x-Autodesk-DWF"
width="250" height="250"> <param name="dwffilename"
value="path" /> </object>
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Nov 8, 2010
I have a custom ExpressionBuilder in whixh I'm trying to add a list of optional parameters. My method would be declared as follows:
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<ext:Button ID="btnEdit" runat="server" Text="<%$ AppResources : edit_text %>">
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Oct 6, 2010
I have a simple Web Service method defined as:
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string MyWebMethod(string foo, string bar)
{
// DataContractJsonSerializer to deserialize foo and bar to
// their respective FooClass and BarClass objects.
return "{"Message":"Everything is a-ok!"}";
}
I'll call it from the client via:
var myParams = { "foo":{"name":"Bob Smith", "age":50},"bar":{"color":"blue","size":"large","quantity":2} };
$.ajax({
type: 'POST',
url: 'https://mydomain.com/WebServices/TestSvc.asmx/MyWebMethod',
data: JSON.stringify(myParams),
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (response, status) {
alert('Yay!');
},
error: function (xhr, err) {
alert('Boo-urns!');
}
});
However, this yields the following error (a breakpoint on the first line in MyWebMethod() is never hit):
{"Message":"No parameterless
constructor defined for type of
u0027System.Stringu0027.","StackTrace":"
at
System.Web.Script.Serialization.ObjectConverter.ConvertDictionaryToObject(IDictionary2
dictionary, Type type,
JavaScriptSerializer serializer,
Boolean throwOnError, Object&
convertedObject)
at
System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object
o, Type type, JavaScriptSerializer
serializer, Boolean throwOnError,
Object& convertedObject)
at
System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object
o, Type type, JavaScriptSerializer
serializer, Boolean throwOnError,
Object& convertedObject)
at
System.Web.Script.Services.WebServiceMethodData.StrongTypeParameters(IDictionary2
rawParams)
at
System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext
context, WebServiceMethodData
methodData, IDictionary`2
rawParams)
at
System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext
context, WebServiceMethodData
methodData)","ExceptionType":"System.MissingMethodException"}
I'd like to pass in two string parameters and use DataContractJsonSerializer to write new Foo and Bar objects. Am I missing something?
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Nov 12, 2010
I am creating a DataSet to attach to a report (*.rdlc). In the DataSet is a TableAdapter that has the GetData(@start, @end) function. Can someone please explain how I get values in to @start and @end? I have searched and seen that it might have something to do with overriding the Fill function in the DataSet code behind file. Please let me know.
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Mar 13, 2011
I have used a sql data source to connect to ORACLE.
Select command is working fine, as soon as I try to provide a parameter, it doesn;t work.
Getting following error " ORA-01036: illegal variable name/number"
Tried searching for error message -- but It says the parameters name has to be less then 32 characters, which is what I have.
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:DevConnection %>"
ProviderName="<%$ ConnectionStrings:DevConnection.ProviderName %>" SelectCommand="Select ID, Name from Employee where state = @stateid">
<SelectParameters>
<asp:ControlParameter Name ="stateid" ControlID = "drdState" PropertyName = "SelectedValue" />
</SelectParameters>
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Aug 18, 2010
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Mar 6, 2013
I have a dynamic created drop down list - and I set the event of it to be like this:
ddlAnswer.ID = "ddlistAnswer" + QuestionID;
ddlAnswer.SelectedIndexChanged += new EventHandler(ddlAnswer_SelectedIndexChanged);
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Code:
protected void ddlAnswer_SelectedIndexChanged(object sender, EventArgs e)
{
//wanting that question id here
}
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Jun 9, 2012
STR= "SELCT * from tbl1 ";
if (drpyrsal.SelectedValue != "--Select--")
{
STR= STR+ " and Year([frmdt])=" + drpyrsal.SelectedValue + " ";
}
if (drpmonth.SelectedValue != "--Select--")
{
STR= STR+ "and Month([frmdt])=" + drpmonth.SelectedValue + " ";
}
and execute it with dataset
how can i do the same with SP
SqlCommand cmd = new SqlCommand("usp_SP1", con); // Stored procedure
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@yr", drpyrsal.SelectedValue);
cmd.Parameters.AddWithValue("@mon", drpmonth.SelectedValue);
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Nov 5, 2010
I have such a text for example:
"A01+B02+C03+D04+E05+F06+G07+H08+I09+J10+K11+L12+M13+N14+O15+P16"
I would like to add a space after each fourth '+' sign.
This is because if the text is too long in the grid's cell in my page, then it's simply cut off. So I'm thinking to simply wrap the string before binding the data to the grid.
I've played around with several string methods, like getting the IndexOf and the adding a space with Insert, or using a StringBuilder to make a completely new string out of the original one, but I just can't get the final solution running.
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Jun 11, 2010
passing parameters from a datalist to another page.
this is how my app works:
i have a database ( access) a table with the following columns: id,title,desc,photo.
another table with the following columns: (startsin, endsin,price,tId)
on the first page (tourpack.aspx) i have a datalist, when user clicks on a button that is in the templateitem of the datalist, he will be transfered to another page called (showtour.aspx). what im trying to do is passing the ID parameter from the first page (table 1) to the second page (showtour.aspx) with the id number so he can see the specific details of that "tour" that are located In the second table.
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Jan 7, 2010
Im wonding what the correct syntax is to pass 2 parameters from a Ascx control into a Vb.net function? Heres what I currently have:
<asp:Literal
ID="CommentFooterLiteral1"
Visible='<%# Eval("Approved") Or IsModerator() %>'
Text='<%# FormatFooter(Eval("Anonymous"), Eval("DisplayName"), Eval("CreatedDate")) + "
" + GetModeratorStatus(Eval("UserId")) %>'
runat="server"
/>
The Function "FormatFooter", needs to pass in Anonymous and DisplayName parameters. Anyone know the correct syntax for doing this?
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Sep 20, 2010
I am trying to pass parameters in the hyperlink.
The code in sending page is as below
[Code]....
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Aug 9, 2010
I followd Brian Orrell LINQ tutorial for paging/sorting and created a gridview bound to an ObjectDataSource through a method call which gets data from adatabase. My form includes two buttons with a textbox next to each one of them. I need to be able to populatte th egridview depending on the button that was pressed, I cannot figure out how signal my method which button was pressed.
[Code]....
[URL]
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Oct 23, 2010
I'm trying to do a form submit to my controller through jQuery Ajax. The following code works for the most part, however, the ThreadId parameter does not get passed. If I call the controller directly without using jQuery, it gets passed, but when using jquery, I don't see the ThreadId after form.serialize(). WHat would be the easiest way to pass parameters (like ThreadId) to jQuery form post?
[code]....
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Jan 24, 2011
I need to execute the following exe file with multiple arguments from asp.net web application
"C:Program FilesSysteminvoke.exe" /project "UPLOAD" /app "Default App" /task "XMLGEN" /parm.OutputDirectory "c: emp"
I tried the following asp.net code,
[code]....
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Jun 3, 2010
I am trying to pass the parameters dynamically thru Sqldatasource and get the results in grid view. Based on the dropdown list selection it has to show the results in grid view. When I hard code its giving correct results but when passing thru parameters i'm unable to get the results in grid view.
Output shud be something like this:
Select the value: 123
124
125.
Lets say user selects '123', the query it runs in sqldatasource is Select col1,col2,col3 from table1 where col1 LIKE '123%'
results will be 12301,12302,12303 with other columns in grid view.
[code]....
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