drop down list had zero value
<p>I had ddl which in selected changed it execute some code 
but when i tried to do that it wasn't worked well  WHEN i checked the reason i found that ddl in selected value =0 also i made all well and this is my code </p>

<pre><code>protected void DDlProductFamily_SelectedIndexChanged(object sender, EventArgs e)
{
    if (DDlProductFamily.DataValueField.Contains("ProductCategory_Id"))
            using (SqlConnection Con = Connection.GetConnection())
    {
        SqlCommand Com = new SqlCommand("GetListViewByProductCategory", Con);
        Com.CommandType = CommandType.StoredProcedure;
        Com.Parameters.Add(Parameter.NewInt("@ProductCategory_Id", DDlProductFamily.SelectedValue.ToString()));
        SqlDataAdapter DA = new SqlDataAdapter(Com);
        DA.Fill(dt);
        DataList1.DataSource = dt;
        DataList1.DataBind();
    }
}
</code></pre>
