how can I connect to database - database-connection

Question

I use this but I can't connect DataBase
conn1.Open();
using (OracleCommand crtCommand = new OracleCommand);

Answer 1

for connect to Oracle from application
string command = "Enter your command";
OracleConnection orclecon;
orclecon = new OracleConnection(connection);
orclecon.Open();
use this for select commands:
DataSet ds = new DataSet();
using (OracleDataAdapter Oda = new OracleDataAdapter(command, orclecon))
{
Oda.Fill(ds);
}
and use this for insert/update/delete commands:
//used for Oracle command (insert,update,delete) if number of rows that affected >0 return true else return false
using (OracleCommand orclcommand = new OracleCommand(command, orclecon))
{
int n = orclcommand.ExecuteNonQuery();
if (n > 0)
return true;
else
return false;
}
orclecon.Close();

Answer 2

To make it dynamic use this;
string sentence = "";
string formatprototype = "";//This will hold the string to be formatted.
string output="";
public void SearchString()
{
string pattern = #".*[ ]+?[\""]{1}(?<String>[a-zA-Z0-9_]*)[\""]{1}[ ]+?MINVALUE[ ]*(?<MinValue>[-?\d]*)[ ]*MAXVALUE[ ]*(?<MaxValue>[\d]*)[ ]+?[INCREMENT]*[ ]+?[BY]*[ ]+?(?<IncrementBy>[\d]*)[ ]+?[START]*[ ]+?[WITH]*[ ]+?(?<StartWith>[\d]*)[ ]+?[CACHE]*[ ]+?(?<Cache>[\d]*)\s+?";
Regex regex = new Regex(pattern);
Match match = regex.Match(sentence);
Group #string = match.Groups[1];
Group minvalue = match.Groups[2];
Group maxvalue = match.Groups[3];
Group incrementby = match.Groups[4];
Group startswith = match.Groups[5];
Group cache = match.Groups[6];
formatprototype = #"CREATE SEQUENCE ""{0}"" MINVALUE {1} MAXVALUE {2} INCREMENT BY {3} START WITH {4} CACHE {5} NOORDER NOCYCLE";
if (minvalue.Value.StartsWith("-"))
{
output = string.Format(formatprototype, #string, minvalue, maxvalue, incrementby, maxvalue, cache);
}
else if (!minvalue.Value.StartsWith("-"))
{
output = string.Format(formatprototype, #string, minvalue, maxvalue, incrementby, minvalue, cache);
}
MessageBox.Show(output);
}
Assume that SearchString() is the function in which you are doing this stuff.And make sure to assign each string that is extracted from database,to sentence.Try it and reply if it worked or not.