C# assign value to double list

Question

 I have below code to add CT number into the CTlist. end up when i ran the code, CTlist[i] still = 1,  althought CT = 100(extracted from database). Any suggestion are much appreciated

 

sqlConSN.Open();

double CT1 = 1;

double CT2 = 1;

double CT3 = 1;

double CT4 = 1;

 

List<double> CTlist = new List<double>();

CTlist.Add(CT1);

CTlist.Add(CT2);

CTlist.Add(CT3);

CTlist.Add(CT4);

int d = 1;

int i = 0;

for (int n = 0; n < 10; n++)

{

String sqlSelectQueryID = ("Select * FROM tblSN WHERE ID = @ID");

SqlCommand sqlCmdIDLoad = new SqlCommand(sqlSelectQueryID, sqlConSN);

sqlCmdIDLoad.Parameters.Add("@ID", System.Data.SqlDbType.VarChar).Value = d;

SqlDataReader drIDReader = sqlCmdIDLoad.ExecuteReader();

if (drIDReader.Read())

{

string strCT = (drIDReader["TestH1"].ToString());

string strFAT = (drIDReader["TestH27"].ToString());

double CT;

double FAT;

if (Double.TryParse(strCT, out CT))

{

}

if (Double.TryParse(strFAT, out FAT))

{

}

if (FAT >= 1)

{

CTlist[i] = CT;

i++;

d++;

}

else

{

d++;

n = n - 1;

}

}

}