ok this is code:

 private void GetDocumentInfo(int pageIndex)
    {

        using (SqlConnection conn = General.GetConnection())
        {
            using (SqlCommand cmd = General.GetCommand("NewOrder_Info", conn))
            {
                int data1 = Convert.ToInt32(Request.QueryString["PeygiriCode"].ToString());
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@PageIndex", pageIndex);
                cmd.Parameters.AddWithValue("@PageSize", PageSize);
                cmd.Parameters.AddWithValue("@PeygiriCode", data1);
                cmd.Parameters.Add("@RecordCount", SqlDbType.Int, 4);
                cmd.Parameters["@RecordCount"].Direction = ParameterDirection.Output;
                conn.Open();
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    DataTable dt = new DataTable();
                    da.Fill(dt);
                    if (dt["OrderType"].ToString().ToLower() == "buy")
                    {
                        Imagbaygani.Visible = false;
                        Imgsend.Visible = true;
                    }
                    else if (dt["OrderType"].ToString().ToLower() == "link")
                    {
                        Imagbaygani.Visible = true;
                        Imgsend.Visible = false;

                    }
                    else
                    {
                        if (dt["OrderType"].ToString().ToLower() == "Link" && dt["OrderType"].ToString().ToLower() == "buy")
                        {
                            Imagbaygani.Visible = false;
                            Imgsend.Visible = true;
                        }

                    }

                    gvOrders.DataSource =dt;
                    gvOrders.DataBind();
                }

this error happen:

Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS0021: Cannot apply indexing with [] to an expression of type 'DataTable' Source Error:

Line 323:                    DataTable dt = new DataTable();
Line 324:                    da.Fill(dt);
Line 325:                    if (dt["OrderType"].ToString().ToLower() == "buy")
Line 326:                    {
Line 327:                        Imagbaygani.Visible = false;

nedash says:

if (Session["Order"] != null)

{

    DataTable dt = Session["Order"] as DataTable;

    if (dt.Rows.Count > 0)

    {

        if (dt.AsEnumerable().Select(x => x["show"].ToString().ToLower()).Contains("download") && dt.AsEnumerable().Select(x => x["show"].ToString().ToLower()).Contains("buy"))

        {

            PLLink.Visible = false;

            PLBuy.Visible = true;

        }

        else if (dt.AsEnumerable().Select(x => x["show"].ToString().ToLower()).Contains("download") && !dt.AsEnumerable().Select(x => x["show"].ToString().ToLower()).Contains("buy"))

        {

            PLLink.Visible = true;

            PLBuy.Visible = false;

        }

        else if (!dt.AsEnumerable().Select(x => x["show"].ToString().ToLower()).Contains("download") && dt.AsEnumerable().Select(x => x["show"].ToString().ToLower()).Contains("buy"))

        {

            PLLink.Visible = false;

            PLBuy.Visible = true;

 

        }

    }

}

else {

    PLLink.Visible = false;

    PLBuy.Visible = true;

}

 After getting datatable implement the same logic in your code as in the above code.