how we retain dropdwon value after page refresh in asp.net

You can persist the dropdown selection in Session. 1.  Handle teh Dropdown_SelectedIndex change event and save the Selected value in Session.   protected void d1_SelectedIndexChanged(object sender, EventArgs e) { Session["DropDownSelection"] = d1.SelectedValue; // Bind the grid according to the selected value } 2. On Page_Load, Set the Dropdown SelectedIndex according to the saved value in Session.   protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { if (Session["DropDownSelection"] != null) { d1.SelectedIndex = d1.Items.IndexOf( d1.Items.FindByValue(Convert.ToString(Session["DropDownSelection"])); } //Bind the grid accordng to the dropdown selected value } }