Microsoft JScript runtime error: 'Sys' is undefined

Question

dear sir I am writing one program editing in grid view pop up.i have used ajax tool kit.But some problem Generate.Problem is 0x800a1391 - Microsoft JScript runtime error: 'Sys' is undefined.My code is Below. Untitled Page .modalBackground { background-color: Gray; z-index: 10000; } CancelControlID=btnCancel BackgroundCssClass=modalBackground> User Details ID: Name: Designation: aspx.xs page is below using System; using System.Configuration; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.HtmlControls; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Xml.Linq; using AjaxControlToolkit; namespace WebApplication2 { public partial class Forward : System.Web.UI.Page { SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings[CON].ToString()); protected void Page_Load(object sender EventArgs e) { if (!IsPostBack) { BindGridData(); } } protected void BindGridData() { con.Open(); SqlCommand cmd = new SqlCommand(Select idsenderreciver from inbox con); SqlDataAdapter da = new SqlDataAdapter(cmd); DataTable dt = new DataTable(); da.Fill(dt); gvdetails.DataSource = dt; gvdetails.DataBind(); } protected void btnUpdate_Click(object sender EventArgs e) { //con.Open(); //SqlCommand cmd = new SqlCommand(update Table_1 set Name=@NameDesignation=@Designation where ID=@ID con); //cmd.Parameters.AddWithValue(@Name lblusername.Text); //cmd.Parameters.AddWithValue(@Designation txtDesg.Text); //cmd.Parameters.AddWithValue(@ID Convert.ToInt32(lblID.Text)); //cmd.ExecuteNonQuery(); //con.Close(); //lblresult.Text = lblusername.Text +  Details Updated Successfully; //lblresult.ForeColor = Color.Green; //BindGridData(); } protected void imgbtn_Click(object sender ImageClickEventArgs e) { ImageButton btndetails = sender as ImageButton; GridViewRow gvrow = (GridViewRow)btndetails.NamingContainer; lblID.Text = gvdetails.DataKeys[gvrow.RowIndex].Value.ToString(); lblusername.Text = gvrow.Cells[2].Text; txtDesg.Text = gvrow.Cells[3].Text; this.ModalPopupExtender1.Show(); } } }

mohit gupta · Answer

thanksBut I am not using java script.My web config file is ..below For more information on how to configure your ASP.NET application please visit http://go.microsoft.com/fwlink/?LinkId=169433 --> -->

Dipankar Biswas · Answer

see here... http://stackoverflow.com/questions/1931701/microsoft-jscript-runtime-error-sys-is-undefined