How to insert Data in C#

<pre lang="c#">using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data;
using DevExpress.Web.ASPxEditors;
using DevExpress.Web.ASPxGridView;
using MsgBox;
using System.Diagnostics;
using Cutech.Express.Entities;
using Cutech.Web.Framework;
using System.Globalization;
using System.Configuration;
using System.IO;
using System.Drawing.Imaging;
using DevExpress.Web.ASPxUploadControl;

namespace cuteExpress
{
  public partial class Item_AddNew : ExpressPluginControlBase
    {
        Cutech.Express .Entities.Job Job = new Cutech.Express.Entities.Job ();
        String ItemKey=string.Empty;
        String UserName = " ";

        private string m_EventLogSource = "cuteExpressSource";
        private string m_EventLog = "cuteExpressSource";
        private System.Diagnostics.EventLogPermission eventLogPerm;

        EventLog evLog = new EventLog();

                        
        protected void Page_Load(object sender, EventArgs e)
        {
            try
            {

                //Check Event Log Source Exists
                if (!System.Diagnostics.EventLog.SourceExists(m_EventLogSource))
                {
                    System.Diagnostics.EventLog.CreateEventSource(m_EventLogSource, m_EventLog);
                }


                evLog.Source = m_EventLogSource;
                evLog.Log = m_EventLog;
            }
            catch
            {
            }
            if (Request.QueryString["Key"] != null)
            {
                ItemKey = Request.QueryString["Key"].ToString();
                Job.JobKey = ItemKey;
            }
        
            UserName = Context.Profile.UserName;

            //try
            //{



        //    try
        //    {
        //        if (!IsPostBack)
        //        {
        //            cmbCategory.SelectedIndex =0;
        //            cmbUnitOfMeasurement .SelectedIndex =16;

        //      DataSet DSItemDetails =new DataSet ();
        //      DSItemDetails = Job.GetItemDetails(ItemKey);
        //            if (DSItemDetails !=null )
        //            {
                        
        //                if (DSItemDetails.Tables.Count > 0)
        //                {
        //                    if (DSItemDetails.Tables[0].Rows.Count > 0)
        //                    {
        //                        if (DSItemDetails.Tables[0].Rows[0]["ItemName"] != null)
        //                            if (DSItemDetails.Tables[0].Rows[0]["ItemName"].ToString() != "")
        //                                txtItemName.Text = DSItemDetails.Tables[0].Rows[0].ToString();

        //                        if (DSItemDetails.Tables[0].Rows[0]["ItemSpecification"] != null)
        //                            if (DSItemDetails.Tables[0].Rows[0]["ItemSpecification"].ToString() != "")
        //                                txtItemSpecification.Text = DSItemDetails.Tables[0].Rows[0].ToString();

        //                        if (DSItemDetails.Tables[0].Rows[0]["Category"] != null)
        //                            if (DSItemDetails.Tables[0].Rows[0]["Category"].ToString() != "")
        //                                cmbCategory.SelectedIndex = cmbCategory.Items.IndexOfValue(DSItemDetails.Tables[0].Rows[0]["Category"].ToString());

                            

        //                        String AssetType = rblAssetType.SelectedItem.Value.ToString();
        //                        if (AssetType == "Asset" && AssetType == "StoreAsset")
        //                            rblAssetType.SelectedIndex = rblAssetType.Items.IndexOfValue(DSItemDetails.Tables[0].Rows[0]["AssetType"].ToString());


        //                        if (DSItemDetails.Tables[0].Rows[0]["UnitOfMeasurement"] != null)
        //                            if (DSItemDetails.Tables[0].Rows[0]["UnitOfMeasurement"].ToString() != "")
        //                                cmbUnitOfMeasurement.SelectedIndex = cmbUnitOfMeasurement.Items.IndexOfValue(DSItemDetails.Tables[0].Rows[0]["UnitOfMeasurement"].ToString());

        //                        if (DSItemDetails.Tables[0].Rows[0]["Reorderlevel"] != null)
        //                            if (DSItemDetails.Tables[0].Rows[0]["Reorderlevel"].ToString() != "")
        //                                txtReorderLevel.Text = DSItemDetails.Tables[0].Rows[0].ToString();

        //                        if (DSItemDetails.Tables[0].Rows[0]["LifeSpan"] != null)
        //                            if (DSItemDetails.Tables[0].Rows[0]["LifeSpan"].ToString() != "")
        //                                txtLifeSpan.Text = DSItemDetails.Tables[0].Rows[0].ToString();

        //                        if (DSItemDetails.Tables[0].Rows[0]["NeedApproval"] != null)
        //                            if (DSItemDetails.Tables[0].Rows[0]["NeedApproval"].ToString() != "")
        //                                rblNeedApprovalOrNotdx.SelectedIndex = rblNeedApprovalOrNotdx.Items.IndexOfValue(DSItemDetails.Tables[0].Rows[0]["NeedApproval"].ToString());

        //                        if (DSItemDetails.Tables[0].Rows[0]["Description"] != null)
        //                            if (DSItemDetails.Tables[0].Rows[0]["Description"].ToString() != "")
        //                                MemoDescription.Text = DSItemDetails.Tables[0].Rows[0].ToString();

                          
        //                    }
        //                  }
        //                }
        //            }
        //        }

        //    catch (Exception ex)
        //    {
        //        evLog.WriteEntry("Item_AddNew: (!Assign values to control): " + ex.Message.ToString(), EventLogEntryType.Error);
        //    }
                        
        }

       protected void btnSubmitdx_Click(object sender, EventArgs e)
       {
           try
           {
               //Boolean Validation=true;

               String ItemName=txtItemName.Text.ToString();
               String ItemSpecification=txtItemSpecification.Text.ToString ();
               String Category=cmbCategory.SelectedIndex .ToString();
               String AssetType = rblAssetType.SelectedItem.Value.ToString();
               String UnitOfMeasurement=cmbUnitOfMeasurement .SelectedIndex .ToString ();
               Decimal Reorderlevel = 0;
               Decimal LifeSpan=0;
                            
               String NeedApproval=rblNeedApprovalOrNotdx.SelectedItem.Value.ToString();
               String Description=MemoDescription.Text.ToString ();


               //if (Validation && ItemName == "")
               //{
               //    Validation = false;
               //    ScriptManager.RegisterStartupScript(Page, Page.GetType(), "Key", "BaseMessage('Please Enter the Item Name;Error');", true);
               //}

               //if (Validation && ItemSpecification == "")
               //{
               //    Validation = false;
               //    ScriptManager.RegisterStartupScript(Page, Page.GetType(), "Key", "BaseMessage('Please Enter the Item Specification');", true);
               //}      

               //if (Request.QueryString["Key"] != null)
               //{
               //    ItemKey = Request.QueryString["Key"].ToString();
               //}
               //else
               //    Validation = false;


               //if (Validation)
               {
                   Job.ItemInserOrUpdateNewItem(ItemKey, ItemName, ItemSpecification, Category,AssetType, UnitOfMeasurement, Reorderlevel,LifeSpan, NeedApproval, Description);
                   
                   Job.Assignee = Request.QueryString["Assignee"].ToString();
                   string URL = "http://" + Request.Url.Authority + Request.ApplicationPath + "/ViewJob.aspx?JobKey=";
                  
                   this.CallCloseControlEvent();
               }
            }
            catch (Exception ex)
            {
                ScriptManager.RegisterStartupScript(Page, Page.GetType(), "Key", "BaseMessage('Item Creation ERROR ;Error');", true);
                evLog.WriteEntry("Item_AddNew: (Submit): " + ex.Message.ToString(), EventLogEntryType.Error);
                
            }

               }


       protected void uplImage_FileUploadComplete(object sender, DevExpress.Web.ASPxUploadControl.FileUploadCompleteEventArgs e)
       {
           try
           {
               String FileName = e.UploadedFile.FileName;
               String ItemKey = "0";
               String ItemName;

               if (Session["ItemName"] != null && Session["ItemName"] != null)
               {

                   ItemName = Session["ItemName"].ToString();

                   String DocPathToSave = ConfigurationManager.AppSettings.Get("AttachmentsPathForItems");
                   //Directory Creation
                   DocPathToSave += ItemKey + "\\";
                   if (!Directory.Exists(DocPathToSave))
                   {
                       Directory.CreateDirectory(DocPathToSave);
                   }
                   DocPathToSave += ItemKey + "_";
                   String DocumentPathtoSave = DocPathToSave + FileName;

                   //File Creation 
                   if (File.Exists(DocumentPathtoSave))
                   {
                       String[] FiletoSave = FileName.Split('.');
                       int i;
                       for (i = 0; i < 100; i++)
                       {
                           DocumentPathtoSave = DocPathToSave + FiletoSave[0] + "_REV_" + i + "." + FiletoSave[1];
                           if (!File.Exists(DocumentPathtoSave))
                               break;

                       }
                       FileName = FiletoSave[0] + "_REV_" + i + "." + FiletoSave[1];
                   }
                   e.UploadedFile.SaveAs(DocumentPathtoSave, true);
                   e.CallbackData = e.UploadedFile.FileName;
                   e.IsValid = true;
                   Cutech.Express.Entities.Job Item = new Cutech.Express.Entities.Job();
                   Item.InsertItemImages(Convert.ToInt64(ItemKey), ItemName, DocumentPathtoSave, FileName);

               }

           }
           catch (Exception ex)
           {
               e.ErrorText = ex.Message.ToString();
               string str = ex.Message.ToString();
           }
       }

       protected void btnCanceldx_Click(object sender, EventArgs e)
       {
           base.CallCloseControlEvent();
       }


       
    }
}