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while(reader.Read())
{

//reader.FieldCount-->Anzahl der Spalten
}					

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string[] spaltenstrings=new string[datatable.Columns.Count]
for(int i=0;i<datatable.Columns.Count;i++)
{
  spaltenstring[i]=datatable.Columns[i].ColumnName;
}					

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public string[] getNameColumn(){

   .....C# Kode

   return array[];

}					

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public string[] getNameOfDatabaseColumn(String DatabaseTable)
        {
            string[] strColumns;
            //Connection String lasse ich jetzt mal weg
            String SQL = "SELECT * FROM " + DatabaseTable;

            using (SqlConnection connection = new SqlConnection(ConnectionString))
            {
                connection.Open();

                SqlCommand command = new SqlCommand();
                command.CommandType = CommandType.Text;
                command.Connection = connection;
                command.CommandText = SQL;

                DataTable dtbCurrentDatabaseTable = new DataTable();
                dtbCurrentDatabaseTable.TableName = DatabaseTable;

                strColumns = new string[dtbCurrentDatabaseTable.Columns.Count];

                for (int i = 0; i < dtbCurrentDatabaseTable.Columns.Count; i++)
                {
                    strColumns[i] = dtbCurrentDatabaseTable.Columns[i].ColumnName;
                }
            }

            return strColumns;
        }					

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SqlDataAdapter adapter = new SqlDataAdapter(command);					

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adapter.Fill(dtbCurrentDatabaseTable);