how to fix system.outofmemoryexception exception when get string data from database?

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C#3.5

i get this error when i run this code :

Database db = sv.Databases["oldDatabase"];

Database newDatbase = new Database(sv, "newDatabase");
newDatbase.Create();

ScriptingOptions options = new ScriptingOptions();
StringBuilder sb = new StringBuilder();
options.ScriptData = true;
options.ScriptDrops = false;
options.ScriptSchema = true;
options.EnforceScriptingOptions = true;
options.Indexes = true;
options.IncludeHeaders = true;
options.WithDependencies = true;

TableCollection tables = db.Tables;

//conn.Open();
foreach (Microsoft.SqlServer.Management.Smo.Table mytable in tables)
{
foreach (string line in db.Tables[mytable.Name ].EnumScript(options))
{
sb.Append(line + "\r\n");
}
}

string[] splitter = new string[] { "\r\nGO\r\n" };
string[] commandTexts = sb.ToString().Split(splitter, StringSplitOptions.RemoveEmptyEntries);
int indexx = 0;
foreach (string command in commandTexts)
{

indexx = command.IndexOf("SET ");
string command2 = command.Insert(indexx, "use " + newDatabase + "\n");
SqlCommand comm = new SqlCommand(command2, conn);
comm.ExecuteNonQuery();
}
//return true ;
string scriptresult1 = commandTexts[0].ToString();
int index = scriptresult1.IndexOf("SET ");
string scriptresult12 = scriptresult1.Insert(index, "use " + newDatabase + "\n");

int res=sv.ConnectionContext.ExecuteNonQuery(scriptresult12);

return scriptresult12;
}
the error happen when sp(string builder) store more data so how can i fix it ??