Make Column Read Only Sharepoint 2010

PS C:\Users\gadekasa> $spWeb = Get-SPWeb http://abc:5552/sites/AirCraft/
PS C:\Users\gadekasa> $spList = $spWeb.Lists["AllWorkflowDefaultList"]
PS C:\Users\gadekasa> $fields =$spList.Fields["Role"]
PS C:\Users\gadekasa> $fields.ReadOnlyField = $false
PS C:\Users\gadekasa> $fields.update($true)
PS C:\Users\gadekasa> $spList.Update()
PS C:\Users\gadekasa> $spWeb.Dispose()

Adding Custom CSS style in Markup drop down of Sharepoint 2010 HTML editor ribbon

1. Create one css file in 14 hive(you can add it in your visual studio solution by adding layouts mapped folder)

2. add below css class in that file 

/* custom style in */

DIV.ms-rteElement-mkg-H1

{

-ms-name: "marketing-header";

color: #d65c26;

font-family: Verdana,Geneva,sans-serif;

font-weight: normal;

font-size: 2em;

}

WCF with sharepoint 2010 service

Try below code, it works perfectly fine:-

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using System.Linq;
using Microsoft.SharePoint.Linq;
using WCFService.ListWCFService;
namespace WCFService.WP_WCFService
{
    public partial class WP_WCFServiceUserControl : UserControl
    {
       
        protected void Page_Load(object sender, EventArgs e)
        {
           
        }
        protected override void OnPreRender(EventArgs e)
        {
            try
            {
                System.Uri uri = new Uri("http://localhost:16178/_vti_bin/ListData.svc");
               SrgDataContext dc = new SrgDataContext(uri);
               dc.Credentials = System.Net.CredentialCache.DefaultCredentials;
                    var query = from dev in dc.Announcements
                                select new
                                {
                                    Title = dev.Title,
                                    Body = dev.Body,
                                    ExpiryDate = dev.Expires,
                                    Path = dev.Path
                                };
                    gridAnnouncementList.DataSource = query;
                    gridAnnouncementList.DataBind();
             
                //dc.Dispose();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
           

Using Sharepoint rich text box in Web Part

Just add below line in sharepoint project visual web part ascx file:-
<SharePoint:InputFormTextBox runat="server" ID="txtBody" TextMode="MultiLine" ValidationGroup="CreateCase" Rows="8" Columns="40" RichText="true" RichTextMode="FullHtml" AllowHyperlink="true" />

On Enter Button click redirect with querystring as textbox value

put your text box and button in panel with default button

<asp:Panel  DefaultButton="Button1" runat="server">
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" /> </asp:Panel >




OR





<script>

     function button_click(objTextBox, objBtnID) {

         if (window.event.keyCode == 13) {

             if (objTextBox.value != "") {

                 document.getElementById(objBtnID).focus();

                 document.getElementById(objBtnID).click();

             }

            

         }

      }

    </script>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

    <asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

Page load:-

this.TextBox1.Attributes.Add("onkeypress", "button_click(this,'" + this.Button1.ClientID + "')");

protected void Button1_Click(object sender, EventArgs e)

    {

        if (!string.IsNullOrEmpty(TextBox1.Text))

        {

            Response.Redirect("Default2.aspx?text=" + TextBox1.Text);

        }

    }

Logging error to text file c#.Net

1. Add new static "ErrorLoging" class to solution and paste the below code in cs file.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Diagnostics;

/// <summary>
/// class contain methode for logging WriteToErrorLogFile_Trace(string)
/// </summary>
public  static class ErrorLoging
{
    /// <summary>
    /// log error to path metion in web.config file for key "ErrorFolderPath".
    /// new file will be created for each day
    /// </summary>
    /// <param name="msg">error msg to log.</param>
    /// <param name="ex">exception object, Pass null to just log some msg.</param>
    public static void WriteToErrorLogFile_Trace(string msg,Exception ex)
    {
        try
        {
            if (!System.IO.Directory.Exists(System.Configuration.ConfigurationManager.AppSettings["ErrorFolderPath"] + "\\Errors\\"))
            {
                System.IO.Directory.CreateDirectory(System.Configuration.ConfigurationManager.AppSettings["ErrorFolderPath"] + "\\Errors\\");
            }
            //if (!System.IO.File.Exists(Application.StartupPath + "\\Errors\\" + DateTime.Today.Date.ToString().Replace('/', ' ').Replace(':', ' ')+".txt"))
            //{
            //    System.IO.File.Create(Application.StartupPath + "\\Errors\\" + DateTime.Today.Date.ToString().Replace('/', ' ').Replace(':', ' ') + ".txt");
            //}



            FileStream fs1 = new FileStream(System.Configuration.ConfigurationManager.AppSettings["ErrorFolderPath"] + "\\Errors\\" + DateTime.Today.Year.ToString() + DateTime.Now.ToString("MM") + DateTime.Now.ToString("dd") + ".txt", FileMode.Append, FileAccess.Write);
            StreamWriter s1 = new StreamWriter(fs1);

getting querystring from string

I was having a URL as string
e.g. string videoURL="http://www.youtube.com/watch?v=Rz-Lejndrys";

So now if I wanted to get the value of querstring v. We can get sub-string of videoURL or there is one more method to fetch value of v from above string.

 Uri videoPrevUri = new Uri(videoURL);
 string videoID = HttpUtility.ParseQueryString(videoPrevUri.Query).Get("v");

videoID will return you the value of v