Unable to cast object of type 'System.Web.UI.LiteralControl' to type 'System.Web.UI.WebControls.DropDownList'.?

thank you..
am getting error..
literal does not contain a defination for selecteditem or no extension method..??

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
if (((LinkButton)GridView1.Rows[0].Cells[0].Controls[0]).Text == "Insert")
{
SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);

SqlCommand cmd = new SqlCommand();
cmd.CommandText = "INSERT INTO tblTimeSheet(tsProject,tsStartDate,tsEndDate,tsMonday,tsTuesday,tsWednesday,tsThursday,tsFriday,tsSaturday) VALUES(@Project,@StartDate,@EndDate,@Monday,@Tuesday,@Wednesday,@Thursday,@Friday,@Saturday)";
cmd.Parameters.Add("@Project", SqlDbType.VarChar).Value = ((DropDownList)GridView1.Rows[0].Cells[2].Controls[0]).SelectedItem.Text;


//cmd.Parameters.Add("@Project", SqlDbType.VarChar).Value = ((DropDownList)GridView1.Rows[0].Cells[2].FindControl("ddlProject"));
cmd.Parameters.Add("@StartDate", SqlDbType.DateTime).Value = ((TextBox)GridView1.Rows[0].Cells[3].Controls[0]).Text;
cmd.Parameters.Add("@EndDate", SqlDbType.DateTime).Value = ((TextBox)GridView1.Rows[0].Cells[4].Controls[0]).Text;
cmd.Parameters.Add("@Monday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[5].Controls[0]).Text;
cmd.Parameters.Add("@Tuesday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[6].Controls[0]).Text;
cmd.Parameters.Add("@Wednesday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[7].Controls[0]).Text;
cmd.Parameters.Add("@Thursday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[8].Controls[0]).Text;
cmd.Parameters.Add("@Friday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[9].Controls[0]).Text;
cmd.Parameters.Add("@Saturday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[10].Controls[0]).Text;



cmd.Connection = con;

con.Open();

cmd.ExecuteNonQuery();

con.Close();

}


else
{
SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);

SqlCommand cmd = new SqlCommand();
cmd.CommandText = "UPDATE tblTimeSheet SET tsProject=@Project,tsStartDate=@StartDate,tsEndDate=@EndDate,tsMonday=@Monday,tsTuesday=@Tuesday,tsWednesday=@Wednesday,tsThursday=@Thursday,tsFriday=@Friday,tsSaturday=@Saturday WHERE tsID=@ID";


cmd.Parameters.Add("@Project", SqlDbType.VarChar).Value = ((DropDownList)GridView1.Rows[0].Cells[2].Controls[0]).Text;
cmd.Parameters.Add("@StartDate", SqlDbType.DateTime).Value = ((TextBox)GridView1.Rows[0].Cells[3].Controls[0]).Text;
cmd.Parameters.Add("@EndDate", SqlDbType.DateTime).Value = ((TextBox)GridView1.Rows[0].Cells[4].Controls[0]).Text;
cmd.Parameters.Add("@Monday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[5].Controls[0]).Text;
cmd.Parameters.Add("@Tuesday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[6].Controls[0]).Text;
cmd.Parameters.Add("@Wednesday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[7].Controls[0]).Text;
cmd.Parameters.Add("@Thursday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[8].Controls[0]).Text;
cmd.Parameters.Add("@Friday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[9].Controls[0]).Text;
cmd.Parameters.Add("@Saturday", SqlDbType.Decimal).Value = ((TextBox)GridView1.Rows[0].Cells[10].Controls[0]).Text;

cmd.Parameters.Add("@ID", SqlDbType.Int).Value = Convert.ToInt32(GridView1.Rows[e.RowIndex].Cells[1].Text);
cmd.Connection = con;

con.Open();

cmd.ExecuteNonQuery();

con.Close();



}



GridView1.EditIndex = -1;

BindData();