loading aspx page in div

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C#

ASP.NET

Hi, Im using the code below to load an aspx page

.js file

var loadedobjects=""
var rootdomain="http://"+window.location.hostname

function ajaxpage(url, containerid)
{
	var page_request = false
	if (window.XMLHttpRequest) // if Mozilla, Safari etc
	page_request = new XMLHttpRequest()
	else if (window.ActiveXObject)
	{ // if IE
		try 
		{
				page_request = new ActiveXObject("Msxml2.XMLHTTP")
		} 
		catch (e)
		{
			try
			{
				page_request = new ActiveXObject("Microsoft.XMLHTTP")
			}
			catch (e)
			{
			
			}
		}
	}
	else
	return false
	page_request.onreadystatechange=function()
	{
		loadpage(page_request, containerid)
	}
	page_request.open('GET', url, true)
	page_request.send(null)
}


function loadpage(page_request, containerid)
{
	if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1))
	document.getElementById(containerid).innerHTML=page_request.responseText
}

function loadobjs()
{
	if (!document.getElementById)
	return
	for (i=0; i<arguments.length; i++)
	{
		var file=arguments[i]
		var fileref=""
		if (loadedobjects.indexOf(file)==-1)
		{ //Check to see if this object has not already been added to page before proceeding
			if (file.indexOf(".js")!=-1)
			{ //If object is a js file
				fileref=document.createElement('script')
				fileref.setAttribute("type","text/javascript");
				fileref.setAttribute("src", file);
			}
			else if (file.indexOf(".css")!=-1)
			{ //If object is a css file
				fileref=document.createElement("link")
				fileref.setAttribute("rel", "stylesheet");
				fileref.setAttribute("type", "text/css");
				fileref.setAttribute("href", file);
			}
		}
		
		if (fileref!="")
		{
			document.getElementsByTagName("head").item(0).appendChild(fileref)
			loadedobjects+=file+" " //Remember this object as being already added to page
		}
	}
}

and this code in .cs file

Working fine with this code loading simple pages. (just display Hello World!)

protected void AddORG_Click(object sender, EventArgs e)
{
    Page.RegisterClientScriptBlock("ajax", "<script type='text/javascript'>ajaxpage('Main.aspx', 'pageContent')</script>");
}

but when I make the code like this (to store data in the sql). It display the error.

protected void AddORG_Click(object sender, EventArgs e)
{
    Page.RegisterClientScriptBlock("ajax", "<script type='text/javascript'>ajaxpage('Main.aspx', 'pageContent')</script>");
    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["AccountConnectionString"].ConnectionString);
    con.Open();
    string cmdStr = "SELECT count(Org_Name) FROM Organization WHERE Org_Name='" + txtOrgName.Text + "'";
    SqlCommand checkOrgExist = new SqlCommand(cmdStr, con);
    int temp = Convert.ToInt16(checkOrgExist.ExecuteScalar().ToString());
    con.Close();

    if (temp == 1)
    {
        lblError.Visible = true;
        lblError.Text = "Organization already exist, Please try another name.";
        lblError.ForeColor = System.Drawing.Color.Red;
    }
    else
    {
        con.Open();
        string addOrg = "INSERT INTO Organization(Org_Name, Org_Info, User_ID) VALUES(@Org_Name, @Org_Info, @User_ID)";
        SqlCommand add = new SqlCommand(addOrg, con);
        add.Parameters.AddWithValue("@Org_Name", txtOrgName.Text);
        add.Parameters.AddWithValue("@Org_Info", txtOrgInfo.Text);
        add.Parameters.AddWithValue("@User_ID", "12345");

        try
        {
            add.ExecuteNonQuery();
            con.Close();
            lblError.Visible = true;
            lblError.Text = "Successfully Created!";
            lblError.ForeColor = System.Drawing.Color.GreenYellow;
            //Response.Redirect("http://google.com");


        }
        catch (Exception er)
        {
            Response.Write(er);
        }
    }
}

ERROR MESSAGE:
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.Web.HttpException: The state information is invalid for this page and might be corrupted.

anyone can help me solve this problem?

Thanks in advance..