How do I connect to a database with Sql ServerAuthentication

protected void Page_Load(object sender, EventArgs e) 
{ 
SqlConnection sqlobj = new SqlConnection("Data Source = 182.18.175.64 ; Initial Catalog = TamilnaduForestDept ; Login = ***** ; Password = *****; Integrated Security = True");
string sel = "select Status_CommonID,Status_CommonName,Active_Status,EntryBy,EntryDate from Mst_Status_Common"; 
sqlobj.Open(); 
SqlDataAdapter adp = new SqlDataAdapter(sel, sqlobj); 
DataSet ds = new DataSet(); 
adp.Fill(ds); 
for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 
{ 
ddl_StatusCommon.Items.Add(ds.Tables[0].Rows[i].ItemArray[0].ToString());
 } 
} 
protected void ddl_StatusCommon_SelectedIndexChanged(object sender, EventArgs e) 
{ 
SqlConnection sqlobj = new SqlConnection("Data Source = 182.18.175.64 ; Initial Catalog = TamilnaduForestDept ; Login = ******; Password = *****; Integrated Security = True"); 
string sel = "select Status_CommonId,Status_CommonName,Active_Status,EntryBy,EntryDate from office where Status_CommonId = '" + ddl_StatusCommon.SelectedItem.ToString() + "'"; sqlobj.Open(); 
SqlDataAdapter adp = new SqlDataAdapter(sel, sqlobj); 
DataSet ds = new DataSet(); 
adp.Fill(ds); 
for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 
{ 
ddl_StatusCommon.Items.Add(ds.Tables[0].Rows[i].ItemArray[0].ToString());
 } 
}