Tech Junkie Blog - Real World Tutorials, Happy Coding!: September 2013

Friday, September 27, 2013

Thursday, September 19, 2013

Telerik: Why the $find Method is Not Working for RadGrid
The reason the $find method is not working for you is because the RadGrid loads on late binding. You need to get the RadGrid client object in the pageLoad() function like in the code below. After you get it you can set the global variables in the your Javascript so the other function will have access to the RadGrid object. 

    <telerik:RadCodeBlock ID="RadCodeBlock2" runat="server">
        <script type="text/javascript">
            var radGrid = null;
            var masterTableView = null;
            var rgDataItems = null;



            function pageLoad() {
                radGrid = $find("<%= RadGrid1.ClientID %>");
                masterTableView = grid.get_masterTableView();
                rgDataItems = masterTable.get_dataItems();
             }
        </script>
    </telerik:RadCodeBlock>

Tuesday, September 17, 2013

ASP.NET: Simulate a Button Click in Code Behind
In this blog, I will go over how you can simulate a button click postback.  By using the RaisePostBackEvent()  method.  Many of you probably want to do this because you wanted to refresh your GridView by faking a postback.  As you will see the two methods presented on this blog does not perform an actual postback, even though it behaves like it does.


Mark Up

    <form id="form1" runat="server">
    <div>
    
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
    
    </div>
    </form>


Code Behind

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication2
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            this.RaiseEvent(this, new EventArgs());
            if (!Page.IsPostBack)
            {
                this.Button1_Click(this, new EventArgs());
            }
        }

        protected void RaiseEvent(object sender, EventArgs e)
        {
            this.RaisePostBackEvent(Button1, " ");
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Response.Write("You've clicked " + Button1.Text + " ");
            
            if (Page.IsPostBack)
            {
                Response.Write("this is a post back");
            }
            else if (!Page.IsPostBack)
            {
                Response.Write("this is not a post back");
                Response.Write("<br/>");
            }
        }
    }
}


After you run the code you will find out that both ways of doing this does not cause a post back event.


 Previous: ASP.NET: Call Stored Procedure Using SqlCommand and SqlDataReader
Next: ASP.NET : WebForms UnobtrusiveValidationMode requires a ScriptResourceMapping for 'jquery'

JQuery: Infinite Loop Button Click 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" EnableEventValidation="false" Inherits="WebApplication2._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.7.1.min.js"></script>
</head>
    <script type="text/javascript">
        
        $(document).ready(function () {
            $("#Button1").click();

        });
    </script>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
    
    </div>
    </form>
</body>
</html>

 Next: JQuery: Using JQuery CDN Set Up

Friday, September 13, 2013

SQL Server : Database Reference For ADO.NET
Microsoft has some great references on ADO.NET, however finding everything you need quickly is another story.  This a quick reference of when you need to find information quickly when working with ADO.NET.

 ADO.NET Data Mappings:

 Oracle Data Type Mappings: http://msdn.microsoft.com/en-us/library/cc716726.aspx

SQL Server Data Type Mappings : http://msdn.microsoft.com/en-us/library/cc716729.aspx

OLE DB Data Type Mappings : https://msdn.microsoft.com/en-us/library/cc668759(v=vs.110).aspx

ODBC Data Type Mappings: https://msdn.microsoft.com/en-us/library/cc668763(v=vs.110).aspx


LINQ References:

 LINQ To SQL : https://msdn.microsoft.com/en-us/library/bb386934%28v=vs.110%29.aspx

LINQ To Entity: https://msdn.microsoft.com/en-us/library/vstudio/bb386964(v=vs.100).aspx

LINQ To XML: https://msdn.microsoft.com/en-us/library/system.xml.linq.aspx

LINQ To Objects: https://msdn.microsoft.com/en-us/library/bb397919.aspx

Previous: C# Querying From An Oracle Database


Thursday, September 5, 2013

C# Querying From An Oracle Database
In this blog we will go over how to query an Oracle database in ASP.NET using the System.Data.OracleClient data provider in C#.

 Namespaces:

using System.Web.Configuration;
using System.Data.OracleClient;
using System.Data; 

            string cs = WebConfigurationManager.ConnectionStrings["SomeConnectionString"].ConnectionString;

            using (OracleConnection oc = new OracleConnection(cs))
            {
                oc.Open();
                DataTable dt = new DataTable(); 
                OracleCommand ocmd = new OracleCommand("SELECT * FROM SOMETABLE", oc);
                OracleDataAdapter oda = new OracleDataAdapter(ocmd);

                oda.Fill(dt);

                GridView1.DataSource = dt;
                GridView1.DataBind();

            }
Previous: Oracle Date Format And Compare

Wednesday, September 4, 2013

Oracle Date Format And Compare
Oracle dates have a different format than SQL Server dates. So to select a date for the Oracle database you have to have the date in the following format. 
string myDate = "10/9/2012 2:55:25 PM";

  string sql = "SELET * FROM SomeTable WHERE SomeDateField=" +
       "to_date('" + myDate + "','" + "MM/DD/YYYY HH:MI:SS " + 
       myDate.Substring(myDate.Length - 2) + "');";

Next: C# Querying From An Oracle Database

Tuesday, September 3, 2013

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