[Solved] ASP.Net Error: invalid postback or callback argument

Hi Amit1992,

Refer below sample.

HTML

CS.aspx

<asp:DataList ID="DataList1" runat="server" RepeatColumns="3" RepeatDirection="Horizontal"
    OnItemCommand="DataList1_OnItemCommand">
    <ItemTemplate>
        <div id="pricePlans">
            <ul id="plans">
                <li class="plan">
                    <li class="planContainer">
                        <li class="title">
                            <h2>
                                <asp:Label ID="Label1" runat="server" Text='<%#Bind("pro_title") %>'></asp:Label>
                            </h2>
                        </li>
                        <li class="title">
                            <asp:Image ID="imgPhoto" runat="server" ImageUrl='<%#Bind("image") %>' />
                        </li>
                        <br />
                        <ul class="options">
                            <li><span>
                                <asp:Label ID="lbldescrp" runat="server" Text='<%#Bind("description") %>'></asp:Label>
                            </span></li>
                            <li><span>
                                <asp:Label ID="lblPrice" runat="server" ForeColor="Red" Text='<%#Bind("pro_price") %>'></asp:Label>
                            </span></li>
                        </ul>
                    </li>
                    <br />
                    <asp:Button ID="Button1" runat="server" CssClass="buton" Text="Full Details" CommandArgument='<%#Eval("pro_id")%>'
                        CommandName="viewdetail" CausesValidation="False" />
                </li>
            </ul>
        </div>
    </ItemTemplate>
</asp:DataList>

Default.aspx

<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1">
    <ItemTemplate>
        <asp:Label ID="Label1" runat="server" Text='<%#Eval("pro_title") %>'></asp:Label>
        <br />
        <asp:Image ID="imgPhoto" runat="server" Width="140px" Height="145px" ImageUrl='<%#Eval("image") %>' />
        <br />
        <asp:Label ID="lbldescrp" runat="server" Text='<%#Eval("description") %>'></asp:Label>
        <br />
        <asp:Label ID="lblPrice" runat="server" ForeColor="Red" Text='<%#Eval("pro_price") %>'></asp:Label>
    </ItemTemplate>
</asp:DataList>
<br />
<br />
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:constr %>"
    SelectCommand="SELECT * FROM [ProductData] WHERE ([pro_id] = @pro_id)">
    <SelectParameters>
        <asp:QueryStringParameter Name="pro_id" QueryStringField="pro_id" Type="String" />
    </SelectParameters>
</asp:SqlDataSource>

Namespaces

C#

using System.Data;
using System.Data.SqlClient;
using System.Configuration;

VB.Net

Imports System.Data
Imports System.Data.SqlClient
Imports System.Configuration

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        SqlConnection con = new SqlConnection(constr);
        SqlCommand cmd = new SqlCommand("SELECT * FROM ProductData", con);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        da.Fill(dt);
        DataList1.DataSource = dt;
        DataList1.DataBind();
    }
}

protected void DataList1_OnItemCommand(object source, DataListCommandEventArgs e)
{
    if (e.CommandArgument != null)
    {
        Response.Redirect("Default.aspx?pro_id=" + e.CommandArgument.ToString());
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)Handle Me.Load
        If Not Me.IsPostBack Then
            Dim constr As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
            Dim con As SqlConnection = New SqlConnection(constr)
            Dim cmd As SqlCommand = New SqlCommand("SELECT * FROM ProductData", con)
            Dim da As SqlDataAdapter = New SqlDataAdapter(cmd)
            Dim dt As DataTable = New DataTable()
            da.Fill(dt)
            DataList1.DataSource = dt
            DataList1.DataBind()
        End If
    End Sub

    Protected Sub DataList1_OnItemCommand(ByVal source As Object, ByVal e As DataListCommandEventArgs)
        If e.CommandArgument IsNot Nothing Then
            Response.Redirect("Default.aspx?pro_id=" & e.CommandArgument.ToString())
        End If
End Sub

Screenshot