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protected void ListBox2_SelectedIndexChanged(object sender, EventArgs e)
{
ListBox3.Items.Clear();
SqlConnection con = new SqlConnection("Server=.;database=Login;uid=sa;pwd=179425532;");
try
{
con.Open();
string strwhere = ListBox2.SelectedValue;
SqlDataAdapter da = new SqlDataAdapter("select * from v_ClassTwo_ClassThree where classTwoID=" + strwhere, con);
DataSet ds = new DataSet();
da.Fill(ds);
ListBox3.DataSource = ds.Tables[0];
ListBox3.DataTextField = "classThree";
ListBox3.DataValueField = "id";
ListBox3.DataBind();
}
catch (Exception ex)
{
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using System.Data;
using System.Configuration;
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