Invalid postback or callback argument

Question

When i try to click on gridview button then i am getting error like this

Invalid postback or callback argument.

System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Sanjeeb Lenka · Answer

Hi Amit its happening due to binding the grid view in pageload if (!IsPostBack) { showDataItem(); } else { DataSet tempDs = gvItems.DataSource as DataSet; gvItems.DataSource = tempDs; gvItems.DataBind(); } in the above code why are you binding the grid again because its already binding within showdataItem(): remove this three line and check. if (!IsPostBack) { showDataItem(); }

Amit Kumar · Answer

thnk you sir.

Amit Kumar · Answer

ShowFooter=true AllowPaging=true AllowSorting=true HeaderStyle-BackColor=#61A6F8 EnableViewState=true ForeColor=white HeaderStyle-ForeColor=White PageSize=4 OnRowCancelingEdit=gvItems_RowCancelingEdit OnRowCommand=gvItems_RowCommand OnRowDeleting=gvItems_RowDeleting OnRowEditing=gvItems_RowEditing OnRowUpdating=gvItems_RowUpdating OnPageIndexChanging=gvItems_PageIndexChanging> ToolTip=Update Height=20px Width=20px /> ToolTip=Cancel Height=20px Width=20px /> ToolTip=Edit Height=20px Width=20px /> ImageUrl=~/Images/delete.jpg ToolTip=Delete Height=20px Width=20px /> CommandName=AddNew Width=30px Height=30px ToolTip=Add new User /> '> '> FilterType=Numbers> '> '> ' TextMode=MultiLine Rows=5> '> ' Width=43px> '> FilterType=Numbers> ' Width=37px> FilterType=Numbers> '> FilterType=Numbers> ' Width=34px> '> ' Width=150px Height=150px /> and .cs code public partial class AddItems : System.Web.UI.Page { SqlConnection con; SqlCommand ecmd acmd dcmd; string str = ConfigurationManager.ConnectionStrings[connect].ConnectionString; LoginView lv; protected void Page_Load(object sender EventArgs e) { lv = (LoginView)Master.FindControl(HeadLoginView); if (!lv.Page.User.Identity.IsAuthenticated) { Response.Redirect(~/Account/Login.aspx?ReturnUrl=~/AddItems.aspx); } else { string lname = lv.Page.User.Identity.Name; if (!lname.Equals(amit)) { Response.Redirect(Default.aspx); } } if (!IsPostBack) { showDataItem(); } else { DataSet tempDs = gvItems.DataSource as DataSet; gvItems.DataSource = tempDs; gvItems.DataBind(); } } protected void showDataItem() { con = new SqlConnection(str); con.Open(); SqlCommand cmd = new SqlCommand(select * from Items con); SqlDataAdapter da = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); gvItems.DataSource = ds; gvItems.DataBind(); con.Close(); } protected void gvItems_RowCommand(object sender GridViewCommandEventArgs e) { if (e.CommandName.Equals(AddNew)) { lblMsg.Text = ; con = new SqlConnection(str); con.Open(); int IcatID = Convert.ToInt32(((TextBox)gvItems.FooterRow.FindControl(txtfCategoryID)).Text); string Iname = ((TextBox)gvItems.FooterRow.FindControl(txtfname)).Text; string Idesc = ((TextBox)gvItems.FooterRow.FindControl(txtfDescription)).Text; int IPrice = Convert.ToInt32(((TextBox)gvItems.FooterRow.FindControl(txtfPrice)).Text); int IQuantity = Convert.ToInt32(((TextBox)gvItems.FooterRow.FindControl(txtfQuantity)).Text); string IStatus = ((TextBox)gvItems.FooterRow.FindControl(txtfStatus)).Text; FileUpload IImag = (FileUpload)gvItems.FooterRow.FindControl(fuAddImg); if (IImag.HasFile) { IImag.SaveAs(Server.MapPath(~/Images/Items/) + IImag.FileName); acmd = new SqlCommand(insert into Items(CategoryIDNameDescriptionPriceQuantityStatusImageUrl) values (@a@b@c@d@e@f@g) con); acmd.Parameters.AddWithValue(@a IcatID); acmd.Parameters.AddWithValue(@b Iname); acmd.Parameters.AddWithValue(@c Idesc); acmd.Parameters.AddWithValue(@d IPrice); acmd.Parameters.AddWithValue(@e IQuantity); acmd.Parameters.AddWithValue(@f IStatus); acmd.Parameters.AddWithValue(@g ~/Images/Items/ + IImag.FileName); acmd.ExecuteNonQuery(); con.Close(); } else { lblMsg.Text = Item category requires an Image; lblMsg.ForeColor = Color.Red; } showDataItem(); } } protected void gvItems_RowDeleting(object sender GridViewDeleteEventArgs e) { int getItemID = Convert.ToInt32(gvItems.DataKeys[e.RowIndex].Values[ItemID].ToString()); con = new SqlConnection(str); con.Open(); dcmd = new SqlCommand(delete from Items where ItemID=@a con); dcmd.Parameters.AddWithValue(@a getItemID); int flag = dcmd.ExecuteNonQuery(); if (flag == 1) { lblMsg.Text = Record Deleted Successfully; lblMsg.ForeColor = Color.Green; } else { lblMsg.Text = Deletion UnSuccessfull; lblMsg.ForeColor = Color.Red; } con.Close(); showDataItem(); } protected void gvItems_RowEditing(object sender GridViewEditEventArgs e) { DataSet tempDs = gvItems.DataSource as DataSet; gvItems.EditIndex = e.NewEditIndex; gvItems.DataSource = tempDs; gvItems.DataBind(); } protected void gvItems_RowUpdating(object sender GridViewUpdateEventArgs e) { GridViewRow row = gvItems.Rows[e.RowIndex]; int itemEID=Convert.ToInt32(gvItems.DataKeys[e.RowIndex].Values[ItemID].ToString()); TextBox txtCatID = (TextBox)row.FindControl(txtCatID); string Iname = ((TextBox)row.FindControl(txtname)).Text; string Idesc = ((TextBox)row.FindControl(txtDescription)).Text; int IPrice = Convert.ToInt32(((TextBox)row.FindControl(txtPrice)).Text); int IQuantity = Convert.ToInt32(((TextBox)row.FindControl(txtQuantity)).Text); string IStatus = ((TextBox)row.FindControl(txtStatus)).Text; FileUpload Iimg =(FileUpload) row.FindControl(fuEditImage); if (Iimg.HasFile) { Iimg.SaveAs(Server.MapPath(~/Images/Items/) + Iimg.FileName); con = new SqlConnection(str); con.Open(); SqlCommand cmdf = new SqlCommand(update Items set CategoryID=@uciName=@unameDescription=@udescPrice=@upriceQuantity=@uquanStatus=@ustatusImageUrl=@uimg where ItemID=@uitem con); cmdf.Parameters.AddWithValue(@uci txtCatID.Text); cmdf.Parameters.AddWithValue(@uname Iname); cmdf.Parameters.AddWithValue(@udesc Idesc); cmdf.Parameters.AddWithValue(@uprice IPrice); cmdf.Parameters.AddWithValue(@uquan IQuantity); cmdf.Parameters.AddWithValue(@ustatus IStatus); cmdf.Parameters.AddWithValue(@uimg ~/Images/Items/ + Iimg.FileName); cmdf.Parameters.AddWithValue(@uitem itemEID); cmdf.ExecuteNonQuery(); con.Close(); gvItems.EditIndex = -1; showDataItem(); con.Close(); } else { con = new SqlConnection(str); con.Open(); SqlCommand cmdnf = new SqlCommand(update Items set CategoryID=@uciName=@unameDescription=@udescPrice=@upriceQuantity=@uquanStatus=@ustatus where ItemID=@uitem con); cmdnf.Parameters.AddWithValue(@uci txtCatID.Text); cmdnf.Parameters.AddWithValue(@unameIname); cmdnf.Parameters.AddWithValue(@udescIdesc); cmdnf.Parameters.AddWithValue(@upriceIPrice); cmdnf.Parameters.AddWithValue(@uquanIQuantity); cmdnf.Parameters.AddWithValue(@ustatusIStatus); cmdnf.Parameters.AddWithValue(@uitem itemEID); cmdnf.ExecuteNonQuery(); con.Close(); gvItems.EditIndex = -1; showDataItem(); } } protected void gvItems_RowCancelingEdit(object sender GridViewCancelEditEventArgs e) { gvItems.EditIndex = -1; showDataItem(); } protected void gvItems_PageIndexChanging(object sender GridViewPageEventArgs e) { gvItems.PageIndex = e.NewPageIndex; showDataItem(); } }

Sanjeeb Lenka · Answer

plz share you code...