DropDownlist Not work properly

Hi dear friends,

I am using One Drop Down list and bind the datas from SQL Server 2005. after that i have to select one item from Dropdown list and if i click the button(i use button also) it will redirect to another page with that drop downlist text as in a querystring.

i show my code here...

In ASPX Page:

 




In Load:

SqlCommand cmd = new SqlCommand("sp_get", connection);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Connection.Open();
SqlDataAdapter sda = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
sda.Fill(dt);
cmd.Connection.Close();
getlist.DataSource = dt;
getlist.DataTextField = "t_type";
getlist.DataBind();

Button Click Event:

  string text = getlist.SelectedItem.Text.ToString();
        Response.Redirect("searchresults.aspx?data="+text);


But it works upto bind data from DB.. When i click the button it fire to redirected page but not getting and querystring value. Even a data could not be stored in String "Text"..

Please say the solution for this.....