Please view this code to see what is wrong??

[_nabuchodonozor]

Hi,

I want to be able change data in dataGrid after SelectedIndex in
DropDownList is changed. DataGrid1 visible is set on false and after
SelectedIndexChanged in DropDownList visible should be set on
true(first line in BindData(string nazwaPrzedmiotu)). But even if it
is defoult true I can see dataGrid but nothing has changed there:/ I
don't know why:/ how to solve this problem please help... There is
the code:
protected void BindData(string nazwaPrzedmiotu)
{
DataGrid1.Visible = true;
string CS = "workstation id=(local);packet
size=4096;integrated security=SSPI;data source=(local);persist
security info=False;initial catalog=sosik";
SqlConnection conSOS = new SqlConnection(CS);
string qry = "WybierzPytanie";
SqlCommand cmdNazwa = new SqlCommand(qry, conSOS);
cmdNazwa.CommandType = CommandType.StoredProcedure;
conSOS.Open();
SqlCommandBuilder.DeriveParameters(cmdNazwa);
cmdNazwa.Parameters["@nazwaPrzedmiotu"].Value =
nazwaPrzedmiotu;
cmdNazwa.Parameters["@przedmiotyID"].Value = 1;
cmdNazwa.ExecuteNonQuery();
SqlDataAdapter daNazwa = new SqlDataAdapter(cmdNazwa);

DataTable tblClient = new DataTable();
daNazwa.Fill(tblClient);
DataGrid1.DataSource = tblClient;
DataGrid1.DataBind();
conSOS.Close();
}
protected void
DropDownListWybierzprzedmiot_SelectedIndexChanged( object sender,
EventArgs e)
{

BindData(DropDownListWybierzprzedmiot.SelectedItem .Text.ToString());
}